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zhangyue e0d0a83c1f SFS API DOC 
Reviewed-by: Muller, Martin <martin.muller@t-systems.com>
Co-authored-by: zhangyue <zhangyue164@huawei.com>
Co-committed-by: zhangyue <zhangyue164@huawei.com>
2025-04-14 12:20:07 +00:00

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<a name="sfs_02_0104"></a><a name="sfs_02_0104"></a>
<h1 class="topictitle1">Authentication of Signature in a Header</h1>
<div id="body0000001389355573"><p class="msonormal" id="sfs_02_0104__en-us_topic_0000001311148725_p11949699">For all General Purpose File System API operations, the identity authentication can be done by carrying signatures in headers.</p>
<p class="msonormal" id="sfs_02_0104__en-us_topic_0000001311148725_p40438427">In the header, the signature is carried in the authorization header field of the HTTP message. The format of the message header is as follows:</p>
<pre class="screen" id="sfs_02_0104__en-us_topic_0000001311148725_screen28401526">Authorization: OBS AccessKeyID:signature</pre>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p917810464285">The signature algorithm process is as follows:</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p97925720284">1. Construct the request character string (StringToSign).</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p15741059313">2. Perform UTF-8 encoding on the result obtained from the preceding step.</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p225613719312">3. Use the SK to perform the HMAC-SHA1 signature calculation on the result obtained from step 2.</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p1436915404327">4. Perform Base64 encoding on the result of step 3 to obtain the signature.</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p771245973610"></p>
<div class="p" id="sfs_02_0104__en-us_topic_0000001311148725_p68921631143520">The StringToSign is constructed according to the following rules. <a href="#sfs_02_0104__en-us_topic_0000001311148725_table34479832212511">Table 1</a> describes the parameters.<pre class="screen" id="sfs_02_0104__en-us_topic_0000001311148725_screen34122891">StringToSign =
HTTP-Verb + "\n" +
Content-MD5 + "\n" +
Content-Type + "\n" +
Date + "\n" +
CanonicalizedHeaders + CanonicalizedResource</pre>
<div class="tablenoborder"><a name="sfs_02_0104__en-us_topic_0000001311148725_table34479832212511"></a><a name="en-us_topic_0000001311148725_table34479832212511"></a><table cellpadding="4" cellspacing="0" summary="" id="sfs_02_0104__en-us_topic_0000001311148725_table34479832212511" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameters required for constructing a StringToSign</caption><thead align="left"><tr id="sfs_02_0104__en-us_topic_0000001311148725_row42478738"><th align="left" class="cellrowborder" valign="top" width="27%" id="mcps1.3.10.3.2.3.1.1"><p id="sfs_02_0104__en-us_topic_0000001311148725_p18225769">Parameter</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="73%" id="mcps1.3.10.3.2.3.1.2"><p id="sfs_02_0104__en-us_topic_0000001311148725_p67001213">Description</p>
</th>
</tr>
</thead>
<tbody><tr id="sfs_02_0104__en-us_topic_0000001311148725_row58389173"><td class="cellrowborder" valign="top" width="27%" headers="mcps1.3.10.3.2.3.1.1 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p31902586">HTTP-Verb</p>
</td>
<td class="cellrowborder" valign="top" width="73%" headers="mcps1.3.10.3.2.3.1.2 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p33972659">An HTTP request method supported by the REST API. The value can be an HTTP verb such as <strong id="sfs_02_0104__en-us_topic_0000001311148725_b84235270610413">PUT</strong>, <strong id="sfs_02_0104__en-us_topic_0000001311148725_b84235270610415">GET</strong>, or <strong id="sfs_02_0104__en-us_topic_0000001311148725_b84235270610418">DELETE</strong>.</p>
</td>
</tr>
<tr id="sfs_02_0104__en-us_topic_0000001311148725_row14909112213405"><td class="cellrowborder" valign="top" width="27%" headers="mcps1.3.10.3.2.3.1.1 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p132581298408">Content-MD5</p>
</td>
<td class="cellrowborder" valign="top" width="73%" headers="mcps1.3.10.3.2.3.1.2 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p102601629204016">The base64-encoded 128-bit MD5 digest of the message according to RFC 1864. This parameter can be empty.</p>
</td>
</tr>
<tr id="sfs_02_0104__en-us_topic_0000001311148725_row1824493"><td class="cellrowborder" valign="top" width="27%" headers="mcps1.3.10.3.2.3.1.1 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p13566274">Content-Type</p>
</td>
<td class="cellrowborder" valign="top" width="73%" headers="mcps1.3.10.3.2.3.1.2 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p25126432">The message type, for example, <strong id="sfs_02_0104__en-us_topic_0000001311148725_b75786169409">text/plain</strong>.</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p24811297">If a request does not contain this header field, this parameter will be processed as an empty string.</p>
</td>
</tr>
<tr id="sfs_02_0104__en-us_topic_0000001311148725_row63558046"><td class="cellrowborder" valign="top" width="27%" headers="mcps1.3.10.3.2.3.1.1 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p28804613404">Date</p>
</td>
<td class="cellrowborder" valign="top" width="73%" headers="mcps1.3.10.3.2.3.1.2 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p10901346204019">The time when a request is initiated. This parameter uses the RFC 1123 time format. If the deviation between the time specified by this parameter and the server time is over 15 minutes, the server returns error 403.</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p792134614016">This parameter is an empty string when the <strong id="sfs_02_0104__en-us_topic_0000001311148725_b74723321582">x-obs-date</strong> is specified.</p>
</td>
</tr>
<tr id="sfs_02_0104__en-us_topic_0000001311148725_row42990474"><td class="cellrowborder" valign="top" width="27%" headers="mcps1.3.10.3.2.3.1.1 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p59676394">CanonicalizedHeaders</p>
</td>
<td class="cellrowborder" valign="top" width="73%" headers="mcps1.3.10.3.2.3.1.2 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p1949763">The general purpose file system request header field in an HTTP request header, referring to header fields started with <strong id="sfs_02_0104__en-us_topic_0000001311148725_b319919585174">x-obs-</strong>, for example, <strong id="sfs_02_0104__en-us_topic_0000001311148725_b2415161111183">x-obs-date</strong>, <strong id="sfs_02_0104__en-us_topic_0000001311148725_b1872619143186">x-obs-acl</strong>, and <strong id="sfs_02_0104__en-us_topic_0000001311148725_b184151419201818">x-obs-meta-*</strong>.</p>
<ol id="sfs_02_0104__en-us_topic_0000001311148725_ol145715617477"><li id="sfs_02_0104__en-us_topic_0000001311148725_li1685416455352">All characters of keywords in a request header field must be converted to lowercase letters (content values must be case sensitive, for example, <strong id="sfs_02_0104__en-us_topic_0000001311148725_b111291138163018">x-obs-storage-class:STANDARD</strong>). If a request contains multiple header fields, these fields should be organized by keyword in the alphabetical order from a to z.</li><li id="sfs_02_0104__en-us_topic_0000001311148725_li1497111394712">If multiple header fields in a request have the same prefix, combine the header fields into one. For example, <strong id="sfs_02_0104__en-us_topic_0000001311148725_b18992135642213">x-obs-meta-name:name1</strong> and <strong id="sfs_02_0104__en-us_topic_0000001311148725_b615756114620">x-obs-meta-name:name2</strong> should be reorganized into <strong id="sfs_02_0104__en-us_topic_0000001311148725_b76247410237">x-obs-meta-name:name1,name2</strong>. Use comma to separate the values.</li><li id="sfs_02_0104__en-us_topic_0000001311148725_li18224198471">Keywords in the request header field cannot contain non-ASCII or unrecognizable characters, which are also not advisable for values in the request header field. If the two types of characters are necessary, they should be encoded and decoded on the client side. Either URL encoding or Base64 encoding is acceptable, but the server does not perform decoding.</li><li id="sfs_02_0104__en-us_topic_0000001311148725_li8253142214474">Delete meaningless spaces and tabs in a header field. For example, <strong id="sfs_02_0104__en-us_topic_0000001311148725_b1433317110158">x-obs-meta-name: name</strong> (with a meaningless space in the front of <strong id="sfs_02_0104__en-us_topic_0000001311148725_b14794533166">name</strong>) must be changed to <strong id="sfs_02_0104__en-us_topic_0000001311148725_b54278376">x-obs-meta-name:name</strong>.</li><li id="sfs_02_0104__en-us_topic_0000001311148725_li67877331819">Each header field occupies a separate line.</li></ol>
</td>
</tr>
<tr id="sfs_02_0104__en-us_topic_0000001311148725_row7450793"><td class="cellrowborder" valign="top" width="27%" headers="mcps1.3.10.3.2.3.1.1 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p66643399">CanonicalizedResource</p>
</td>
<td class="cellrowborder" valign="top" width="73%" headers="mcps1.3.10.3.2.3.1.2 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p29406249">The general purpose file system specified by an HTTP request. This parameter is constructed as follows:</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p63329656">&lt;File system name + Object name&gt; + [Subresource 1] + [Subresource 2] + ...</p>
<ol id="sfs_02_0104__en-us_topic_0000001311148725_ol135483613475"><li id="sfs_02_0104__en-us_topic_0000001311148725_li1739510379234">File system name and object name, for example, /filesystem/object. If no object name is specified, the entire file system is listed, for example, <strong id="sfs_02_0104__b126993914313">/filesystem/</strong>. If file system name is not specified either, the value of this field is <strong id="sfs_02_0104__b879481712439">/</strong>.</li><li id="sfs_02_0104__en-us_topic_0000001311148725_li14147065556">If a subresource (such as <strong id="sfs_02_0104__en-us_topic_0000001311148725_b2265729202414">?sfsacl</strong>) exists, the subresource must be added.</li><li id="sfs_02_0104__en-us_topic_0000001311148725_li20542104114716">If there are multiple subresources, sort them in the alphabetical order from a to z, and use <strong id="sfs_02_0104__en-us_topic_0000001311148725_b12446849133516">&amp;</strong> to combine the subresources.</li></ol>
<div class="note" id="sfs_02_0104__en-us_topic_0000001311148725_note1239815267372"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="sfs_02_0104__en-us_topic_0000001311148725_ul116221356133916"><li id="sfs_02_0104__en-us_topic_0000001311148725_li156221356133912">A subresource is unique. Do not add subresources with the same keyword (for example, <strong id="sfs_02_0104__en-us_topic_0000001311148725_b377815262398">key=value1&amp;key=value2</strong>) in the same request URL. In this case, signature is computed only based on the first subresource, and only the value of the first subresource takes effect on the actual service.</li></ul>
</div></div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<p class="msonormal" id="sfs_02_0104__en-us_topic_0000001311148725_p34896312">The following table provides some examples of generating StringToSign.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="sfs_02_0104__en-us_topic_0000001311148725_table47748300" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Obtaining the ACL of a file system</caption><thead align="left"><tr id="sfs_02_0104__en-us_topic_0000001311148725_row66793295"><th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.12.2.3.1.1"><p id="sfs_02_0104__en-us_topic_0000001311148725_p41547828">Request Header</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.12.2.3.1.2"><p id="sfs_02_0104__en-us_topic_0000001311148725_p9930893">StringToSign</p>
</th>
</tr>
</thead>
<tbody><tr id="sfs_02_0104__en-us_topic_0000001311148725_row66204867"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.12.2.3.1.1 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p60993981">GET /?sfsacl HTTP/1.1</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p07710137509">Host: filesystem.sfs3.region.example.com</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p41565411">Date: Sat, 12 Oct 2015 08:12:38 GMT</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.12.2.3.1.2 "><p id="sfs_02_0104__en-us_topic_0000001311148725_p11355167">GET \n</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p35087639">\n</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p1478816075319">\n</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p47353302">Sat, 12 Oct 2015 08:12:38 GMT\n</p>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p23526540">/filesystem/?sfsacl</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="sfs_02_0104__en-us_topic_0000001311148725_section1255031191518"><h4 class="sectiontitle">Content-MD5 Algorithm in Java</h4><div class="codecoloring" codetype="Java" id="sfs_02_0104__en-us_topic_0000001311148725_screen203261746171919"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
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<span class="normal">19</span></pre></div></td><td class="code"><div><pre><span></span><span class="kn">import</span><span class="w"> </span><span class="nn">java.security.MessageDigest</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">sun.misc.BASE64Encoder</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.io.UnsupportedEncodingException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.security.NoSuchAlgorithmException</span><span class="p">;</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">Md5</span><span class="p">{</span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="n">String</span><span class="o">[]</span><span class="w"> </span><span class="n">args</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">exampleString</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;blog&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">MessageDigest</span><span class="w"> </span><span class="n">messageDigest</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">MessageDigest</span><span class="p">.</span><span class="na">getInstance</span><span class="p">(</span><span class="s">&quot;MD5&quot;</span><span class="p">);</span><span class="w"> </span>
<span class="w"> </span><span class="n">BASE64Encoder</span><span class="w"> </span><span class="n">encoder</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">BASE64Encoder</span><span class="p">();</span><span class="w"> </span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">contentMd5</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">encoder</span><span class="p">.</span><span class="na">encode</span><span class="p">(</span><span class="n">messageDigest</span><span class="p">.</span><span class="na">digest</span><span class="p">(</span><span class="n">exampleString</span><span class="p">.</span><span class="na">getBytes</span><span class="p">(</span><span class="s">&quot;utf-8&quot;</span><span class="p">)));</span>
<span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="s">&quot;Content-MD5:&quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">contentMd5</span><span class="p">);</span><span class="w"> </span>
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="n">NoSuchAlgorithmException</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">UnsupportedEncodingException</span><span class="w"> </span><span class="n">e</span><span class="p">)</span><span class="w"> </span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">e</span><span class="p">.</span><span class="na">printStackTrace</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="p" id="sfs_02_0104__en-us_topic_0000001311148725_p1327215229377">The signature is generated as follows based on the StringToSign and SK. The hash-based message authentication code algorithm (HMAC algorithm) is used to generate the signature.<pre class="screen" id="sfs_02_0104__en-us_topic_0000001311148725_screen150142413554">Signature = Base64( HMAC-SHA1( YourSecretAccessKeyID, UTF-8-Encoding-Of( StringToSign ) ) )</pre>
</div>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p1533212278457"></p>
<div class="p" id="sfs_02_0104__en-us_topic_0000001311148725_p0492171931017">For example, to create a file system named <strong id="sfs_02_0104__b27191929124620">newfilesystem2</strong> in a region, the client request format is as follows:<pre class="screen" id="sfs_02_0104__en-us_topic_0000001311148725_screen8127628105617">PUT / HTTP/1.1
Host: newfilesystem2.sfs3.<em id="sfs_02_0104__en-us_topic_0000001311148725_i153011141175118">region</em>.example.com
Content-Length: <em id="sfs_02_0104__en-us_topic_0000001311148725_i167312141565">length</em>
Date: Fri, 06 Jul 2018 03:45:51 GMT
x-obs-acl:private
x-obs-storage-class:STANDARD
Authorization: OBS UDSIAMSTUBTEST000254:ydH8ffpcbS6YpeOMcEZfn0wE90c=
&lt;CreateBucketConfiguration xmlns="http://obs.otc.t-systems.com/doc/2016-01-01/"&gt;
&lt;Location&gt;<em id="sfs_02_0104__en-us_topic_0000001311148725_i1478319555234">region</em>&lt;/Location&gt;
&lt;/CreateBucketConfiguration&gt;</pre>
</div>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p16568936164513"></p>
<div class="section" id="sfs_02_0104__en-us_topic_0000001311148725_section131611926171613"><h4 class="sectiontitle">Signature Algorithm in Java</h4><div class="codecoloring" codetype="Java" id="sfs_02_0104__en-us_topic_0000001311148725_screen10483183017405"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
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<span class="normal">216</span></pre></div></td><td class="code"><div><pre><span></span><span class="kn">import</span><span class="w"> </span><span class="nn">java.io.UnsupportedEncodingException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.net.URLEncoder</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.security.InvalidKeyException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.security.NoSuchAlgorithmException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.ArrayList</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Arrays</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Base64</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Collections</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.HashMap</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.List</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Locale</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Map</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.TreeMap</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">javax.crypto.Mac</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">javax.crypto.spec.SecretKeySpec</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.omg.CosNaming.IstringHelper</span><span class="p">;</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">SignDemo</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">SIGN_SEP</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;\n&quot;</span><span class="p">;</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">SFS_PREFIX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;x-obs-&quot;</span><span class="p">;</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">DEFAULT_ENCODING</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;UTF-8&quot;</span><span class="p">;</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">SUB_RESOURCES</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Collections</span><span class="p">.</span><span class="na">unmodifiableList</span><span class="p">(</span><span class="n">Arrays</span><span class="p">.</span><span class="na">asList</span><span class="p">(</span>
<span class="w"> </span><span class="s">&quot;CDNNotifyConfiguration&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;acl&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;append&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;attname&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;backtosource&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;cors&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;customdomain&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;delete&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s">&quot;deletebucket&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;directcoldaccess&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;encryption&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;inventory&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;length&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;lifecycle&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;location&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;logging&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s">&quot;metadata&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;modify&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;name&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;notification&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;orchestration&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;partNumber&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;policy&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;position&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;quota&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s">&quot;rename&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;replication&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;requestPayment&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;response-cache-control&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;response-content-disposition&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s">&quot;response-content-encoding&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;response-content-language&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;response-content-type&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;response-expires&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s">&quot;restore&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;select&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot; storageClass&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;storagePolicy&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;storageinfo&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;tagging&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;torrent&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;truncate&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s">&quot;uploadId&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;uploads&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;versionId&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;versioning&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;versions&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;website&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;x-image-process&quot;</span><span class="p">,</span>
<span class="w"> </span><span class="s">&quot;x-image-save-bucket&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;x-image-save-object&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;x-obs-security-token&quot;</span><span class="p">));</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">ak</span><span class="p">;</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">sk</span><span class="p">;</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">urlEncode</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">input</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">UnsupportedEncodingException</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">URLEncoder</span><span class="p">.</span><span class="na">encode</span><span class="p">(</span><span class="n">input</span><span class="p">,</span><span class="w"> </span><span class="n">DEFAULT_ENCODING</span><span class="p">)</span>
<span class="w"> </span><span class="p">.</span><span class="na">replaceAll</span><span class="p">(</span><span class="s">&quot;%7E&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;~&quot;</span><span class="p">)</span><span class="w"> </span><span class="c1">//for browser</span>
<span class="w"> </span><span class="p">.</span><span class="na">replaceAll</span><span class="p">(</span><span class="s">&quot;%2F&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;/&quot;</span><span class="p">)</span>
<span class="w"> </span><span class="p">.</span><span class="na">replaceAll</span><span class="p">(</span><span class="s">&quot;%20&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;+&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">join</span><span class="p">(</span><span class="n">List</span><span class="o">&lt;?&gt;</span><span class="w"> </span><span class="n">items</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">delimiter</span><span class="p">)</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">StringBuilder</span><span class="w"> </span><span class="n">sb</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">StringBuilder</span><span class="p">();</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="n">items</span><span class="p">.</span><span class="na">size</span><span class="p">();</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">item</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">items</span><span class="p">.</span><span class="na">get</span><span class="p">(</span><span class="n">i</span><span class="p">).</span><span class="na">toString</span><span class="p">();</span>
<span class="w"> </span><span class="n">sb</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">item</span><span class="p">);</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="n">items</span><span class="p">.</span><span class="na">size</span><span class="p">()</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="mi">1</span><span class="p">)</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">sb</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">delimiter</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">sb</span><span class="p">.</span><span class="na">toString</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="nf">isValid</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">input</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="o">!</span><span class="n">input</span><span class="p">.</span><span class="na">equals</span><span class="p">(</span><span class="s">&quot;&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">hamcSha1</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">input</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">NoSuchAlgorithmException</span><span class="p">,</span><span class="w"> </span><span class="n">InvalidKeyException</span><span class="p">,</span><span class="w"> </span><span class="n">UnsupportedEncodingException</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">SecretKeySpec</span><span class="w"> </span><span class="n">signingKey</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">SecretKeySpec</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="na">sk</span><span class="p">.</span><span class="na">getBytes</span><span class="p">(</span><span class="n">DEFAULT_ENCODING</span><span class="p">),</span><span class="w"> </span><span class="s">&quot;HmacSHA1&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="n">Mac</span><span class="w"> </span><span class="n">mac</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Mac</span><span class="p">.</span><span class="na">getInstance</span><span class="p">(</span><span class="s">&quot;HmacSHA1&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="n">mac</span><span class="p">.</span><span class="na">init</span><span class="p">(</span><span class="n">signingKey</span><span class="p">);</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">Base64</span><span class="p">.</span><span class="na">getEncoder</span><span class="p">().</span><span class="na">encodeToString</span><span class="p">(</span><span class="n">mac</span><span class="p">.</span><span class="na">doFinal</span><span class="p">(</span><span class="n">input</span><span class="p">.</span><span class="na">getBytes</span><span class="p">(</span><span class="n">DEFAULT_ENCODING</span><span class="p">)));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">stringToSign</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">httpMethod</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">[]&gt;</span><span class="w"> </span><span class="n">headers</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">queries</span><span class="p">,</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">bucketName</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">objectName</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">Exception</span><span class="p">{</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">contentMd5</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">contentType</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">date</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;&quot;</span><span class="p">;</span>
<span class="w"> </span>
<span class="w"> </span><span class="n">TreeMap</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">canonicalizedHeaders</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">TreeMap</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="p">();</span>
<span class="w"> </span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">key</span><span class="p">;</span>
<span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">temp</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span><span class="p">();</span>
<span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="n">Map</span><span class="p">.</span><span class="na">Entry</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">[]&gt;</span><span class="w"> </span><span class="n">entry</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">headers</span><span class="p">.</span><span class="na">entrySet</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">key</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getKey</span><span class="p">();</span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">key</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="kc">null</span><span class="w"> </span><span class="o">||</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">()</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="kc">null</span><span class="w"> </span><span class="o">||</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">().</span><span class="na">length</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">continue</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="n">key</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">key</span><span class="p">.</span><span class="na">trim</span><span class="p">().</span><span class="na">toLowerCase</span><span class="p">(</span><span class="n">Locale</span><span class="p">.</span><span class="na">ENGLISH</span><span class="p">);</span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">key</span><span class="p">.</span><span class="na">equals</span><span class="p">(</span><span class="s">&quot;content-md5&quot;</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">contentMd5</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">()</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span><span class="p">;</span>
<span class="w"> </span><span class="k">continue</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">key</span><span class="p">.</span><span class="na">equals</span><span class="p">(</span><span class="s">&quot;content-type&quot;</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">contentType</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">()</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span><span class="p">;</span>
<span class="w"> </span><span class="k">continue</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">key</span><span class="p">.</span><span class="na">equals</span><span class="p">(</span><span class="s">&quot;date&quot;</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">date</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">()</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span><span class="p">;</span>
<span class="w"> </span><span class="k">continue</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">key</span><span class="p">.</span><span class="na">startsWith</span><span class="p">(</span><span class="n">OBS_PREFIX</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span>
<span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">value</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">temp</span><span class="p">.</span><span class="na">add</span><span class="p">(</span><span class="n">value</span><span class="p">.</span><span class="na">trim</span><span class="p">());</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">canonicalizedHeaders</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">join</span><span class="p">(</span><span class="n">temp</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;,&quot;</span><span class="p">));</span>
<span class="w"> </span><span class="n">temp</span><span class="p">.</span><span class="na">clear</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">canonicalizedHeaders</span><span class="p">.</span><span class="na">containsKey</span><span class="p">(</span><span class="s">&quot;x-obs-date&quot;</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">date</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span>
<span class="w"> </span><span class="c1">// handle method/content-md5/content-type/date</span>
<span class="w"> </span><span class="n">StringBuilder</span><span class="w"> </span><span class="n">stringToSign</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">StringBuilder</span><span class="p">();</span>
<span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">httpMethod</span><span class="p">).</span><span class="na">append</span><span class="p">(</span><span class="n">SIGN_SEP</span><span class="p">)</span>
<span class="w"> </span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">contentMd5</span><span class="p">).</span><span class="na">append</span><span class="p">(</span><span class="n">SIGN_SEP</span><span class="p">)</span>
<span class="w"> </span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">contentType</span><span class="p">).</span><span class="na">append</span><span class="p">(</span><span class="n">SIGN_SEP</span><span class="p">)</span>
<span class="w"> </span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">date</span><span class="p">).</span><span class="na">append</span><span class="p">(</span><span class="n">SIGN_SEP</span><span class="p">);</span>
<span class="w"> </span>
<span class="w"> </span><span class="c1">// handle canonicalizedHeaders</span>
<span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="n">Map</span><span class="p">.</span><span class="na">Entry</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">entry</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">canonicalizedHeaders</span><span class="p">.</span><span class="na">entrySet</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">entry</span><span class="p">.</span><span class="na">getKey</span><span class="p">()).</span><span class="na">append</span><span class="p">(</span><span class="s">&quot;:&quot;</span><span class="p">).</span><span class="na">append</span><span class="p">(</span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">()).</span><span class="na">append</span><span class="p">(</span><span class="n">SIGN_SEP</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="c1">// handle CanonicalizedResource</span>
<span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="s">&quot;/&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="na">isValid</span><span class="p">(</span><span class="n">bucketName</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">bucketName</span><span class="p">).</span><span class="na">append</span><span class="p">(</span><span class="s">&quot;/&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="na">isValid</span><span class="p">(</span><span class="n">objectName</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="na">urlEncode</span><span class="p">(</span><span class="n">objectName</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="n">TreeMap</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">canonicalizedResource</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">TreeMap</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="p">();</span>
<span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="n">Map</span><span class="p">.</span><span class="na">Entry</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">entry</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">queries</span><span class="p">.</span><span class="na">entrySet</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">key</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getKey</span><span class="p">();</span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">key</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">continue</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">SUB_RESOURCES</span><span class="p">.</span><span class="na">contains</span><span class="p">(</span><span class="n">key</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">canonicalizedResource</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">());</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">canonicalizedResource</span><span class="p">.</span><span class="na">size</span><span class="p">()</span><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="s">&quot;?&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="n">Map</span><span class="p">.</span><span class="na">Entry</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">entry</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">canonicalizedResource</span><span class="p">.</span><span class="na">entrySet</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">entry</span><span class="p">.</span><span class="na">getKey</span><span class="p">());</span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="na">isValid</span><span class="p">(</span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">()))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="s">&quot;=&quot;</span><span class="p">).</span><span class="na">append</span><span class="p">(</span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">());</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="c1">// System.out.println(String.format(&quot;StringToSign:%s%s&quot;, SIGN_SEP, stringToSign.toString()));</span>
<span class="w"> </span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">stringToSign</span><span class="p">.</span><span class="na">toString</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">headerSignature</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">httpMethod</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">[]&gt;</span><span class="w"> </span><span class="n">headers</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">queries</span><span class="p">,</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">bucketName</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">objectName</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">Exception</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="c1">//1. stringToSign</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">stringToSign</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">stringToSign</span><span class="p">(</span><span class="n">httpMethod</span><span class="p">,</span><span class="w"> </span><span class="n">headers</span><span class="p">,</span><span class="w"> </span><span class="n">queries</span><span class="p">,</span><span class="w"> </span><span class="n">bucketName</span><span class="p">,</span><span class="w"> </span><span class="n">objectName</span><span class="p">);</span>
<span class="w"> </span>
<span class="w"> </span><span class="c1">//2. signature</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">String</span><span class="p">.</span><span class="na">format</span><span class="p">(</span><span class="s">&quot;OBS %s:%s&quot;</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">ak</span><span class="p">,</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">hamcSha1</span><span class="p">(</span><span class="n">stringToSign</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">querySignature</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">httpMethod</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">[]&gt;</span><span class="w"> </span><span class="n">headers</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">queries</span><span class="p">,</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">bucketName</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">objectName</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="n">expires</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">Exception</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">headers</span><span class="p">.</span><span class="na">containsKey</span><span class="p">(</span><span class="s">&quot;x-obs-date&quot;</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">headers</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="s">&quot;x-obs-date&quot;</span><span class="p">,</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">String</span><span class="o">[]</span><span class="w"> </span><span class="p">{</span><span class="n">String</span><span class="p">.</span><span class="na">valueOf</span><span class="p">(</span><span class="n">expires</span><span class="p">)});</span>
<span class="w"> </span><span class="p">}</span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">headers</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="s">&quot;date&quot;</span><span class="p">,</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">String</span><span class="o">[]</span><span class="w"> </span><span class="p">{</span><span class="n">String</span><span class="p">.</span><span class="na">valueOf</span><span class="p">(</span><span class="n">expires</span><span class="p">)});</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">//1. stringToSign</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">stringToSign</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">stringToSign</span><span class="p">(</span><span class="n">httpMethod</span><span class="p">,</span><span class="w"> </span><span class="n">headers</span><span class="p">,</span><span class="w"> </span><span class="n">queries</span><span class="p">,</span><span class="w"> </span><span class="n">bucketName</span><span class="p">,</span><span class="w"> </span><span class="n">objectName</span><span class="p">);</span>
<span class="w"> </span>
<span class="w"> </span><span class="c1">//2. signature</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">urlEncode</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="na">hamcSha1</span><span class="p">(</span><span class="n">stringToSign</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="n">String</span><span class="o">[]</span><span class="w"> </span><span class="n">args</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">Exception</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span>
<span class="w"> </span><span class="n">SignDemo</span><span class="w"> </span><span class="n">demo</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">SignDemo</span><span class="p">();</span>
<span class="w"> </span><span class="n">demo</span><span class="p">.</span><span class="na">ak</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;&lt;your-access-key-id&gt;&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">demo</span><span class="p">.</span><span class="na">sk</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;&lt;your-secret-key-id&gt;&quot;</span><span class="p">;</span>
<span class="w"> </span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">bucketName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;bucket-test&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">objectName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;hello.jpg&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">[]&gt;</span><span class="w"> </span><span class="n">headers</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">HashMap</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">[]&gt;</span><span class="p">();</span>
<span class="w"> </span><span class="n">headers</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="s">&quot;date&quot;</span><span class="p">,</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">String</span><span class="o">[]</span><span class="w"> </span><span class="p">{</span><span class="s">&quot;Sat, 12 Oct 2015 08:12:38 GMT&quot;</span><span class="p">});</span>
<span class="w"> </span><span class="n">headers</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="s">&quot;x-obs-acl&quot;</span><span class="p">,</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">String</span><span class="o">[]</span><span class="w"> </span><span class="p">{</span><span class="s">&quot;private&quot;</span><span class="p">});</span>
<span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">queries</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">HashMap</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="p">();</span>
<span class="w"> </span><span class="n">queries</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="s">&quot;acl&quot;</span><span class="p">,</span><span class="w"> </span><span class="kc">null</span><span class="p">);</span>
<span class="w"> </span>
<span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="n">demo</span><span class="p">.</span><span class="na">headerSignature</span><span class="p">(</span><span class="s">&quot;PUT&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">headers</span><span class="p">,</span><span class="w"> </span><span class="n">queries</span><span class="p">,</span><span class="w"> </span><span class="n">bucketName</span><span class="p">,</span><span class="w"> </span><span class="n">objectName</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p122581724201019">The calculation result of the signature is as follows (it varies with the execution time): YdH8ffpcbS6YpeOMcEZfn0wE90c=</p>
</div>
<div class="section" id="sfs_02_0104__en-us_topic_0000001311148725_section1875724541612"><h4 class="sectiontitle">Signature Algorithm in Python</h4><div class="codecoloring" codetype="Python" id="sfs_02_0104__en-us_topic_0000001311148725_screen359133017429"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span>
<span class="normal">20</span>
<span class="normal">21</span>
<span class="normal">22</span>
<span class="normal">23</span></pre></div></td><td class="code"><div><pre><span></span><span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">hashlib</span>
<span class="kn">import</span> <span class="nn">hmac</span>
<span class="kn">import</span> <span class="nn">binascii</span>
<span class="kn">from</span> <span class="nn">datetime</span> <span class="kn">import</span> <span class="n">datetime</span>
<span class="n">IS_PYTHON2</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="o">.</span><span class="n">major</span> <span class="o">==</span> <span class="mi">2</span> <span class="ow">or</span> <span class="n">sys</span><span class="o">.</span><span class="n">version</span> <span class="o">&lt;</span> <span class="s1">'3'</span>
<span class="sd">&quot;&quot;&quot;Hard-coded or plaintext SecretAccessKeyID is risky. For security purposes, encrypt your access key and store it in the configuration file or environment variables. In this example, SecretAccessKeyID is stored in the environment variables for identity authentication. Before running the code in this example, configure environment variable SECRET_ACCESS_KEY_ID.&quot;&quot;&quot;</span>
<span class="n">yourSecretAccessKeyID</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'SECRET_ACCESS_KEY_ID'</span><span class="p">)</span>
<span class="n">httpMethod</span> <span class="o">=</span> <span class="s2">&quot;PUT&quot;</span>
<span class="n">contentType</span> <span class="o">=</span> <span class="s2">&quot;application/xml&quot;</span>
<span class="c1"># &quot;date&quot; is the time when the request was actually generated</span>
<span class="n">date</span> <span class="o">=</span> <span class="n">datetime</span><span class="o">.</span><span class="n">utcnow</span><span class="p">()</span><span class="o">.</span><span class="n">strftime</span><span class="p">(</span><span class="s1">'</span><span class="si">%a</span><span class="s1">, </span><span class="si">%d</span><span class="s1"> %b %Y %H:%M:%S GMT'</span><span class="p">)</span>
<span class="n">canonicalizedHeaders</span> <span class="o">=</span> <span class="s2">&quot;x-obs-acl:private</span><span class="se">\n</span><span class="s2">&quot;</span>
<span class="n">CanonicalizedResource</span> <span class="o">=</span> <span class="s2">&quot;/newfilesystem2&quot;</span>
<span class="n">canonical_string</span> <span class="o">=</span> <span class="n">httpMethod</span> <span class="o">+</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="o">+</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="o">+</span> <span class="n">contentType</span> <span class="o">+</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="o">+</span> <span class="n">date</span> <span class="o">+</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="o">+</span> <span class="n">canonicalizedHeaders</span> <span class="o">+</span> <span class="n">CanonicalizedResource</span>
<span class="k">if</span> <span class="n">IS_PYTHON2</span><span class="p">:</span>
<span class="n">hashed</span> <span class="o">=</span> <span class="n">hmac</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="n">yourSecretAccessKeyID</span><span class="p">,</span> <span class="n">canonical_string</span><span class="p">,</span> <span class="n">hashlib</span><span class="o">.</span><span class="n">sha1</span><span class="p">)</span>
<span class="n">encode_canonical</span> <span class="o">=</span> <span class="n">binascii</span><span class="o">.</span><span class="n">b2a_base64</span><span class="p">(</span><span class="n">hashed</span><span class="o">.</span><span class="n">digest</span><span class="p">())[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">hashed</span> <span class="o">=</span> <span class="n">hmac</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="n">yourSecretAccessKeyID</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'UTF-8'</span><span class="p">),</span> <span class="n">canonical_string</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'UTF-8'</span><span class="p">),</span><span class="n">hashlib</span><span class="o">.</span><span class="n">sha1</span><span class="p">)</span>
<span class="n">encode_canonical</span> <span class="o">=</span> <span class="n">binascii</span><span class="o">.</span><span class="n">b2a_base64</span><span class="p">(</span><span class="n">hashed</span><span class="o">.</span><span class="n">digest</span><span class="p">())[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">'UTF-8'</span><span class="p">)</span>
<span class="nb">print</span> <span class="n">encode_canonical</span>
</pre></div></td></tr></table></div>
</div>
<p id="sfs_02_0104__en-us_topic_0000001311148725_p277391515108">The calculation result of the signature is as follows (it varies with the execution time): YdH8ffpcbS6YpeOMcEZfn0wE90c=</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="sfs_02_0102.html">Authentication</a></div>
</div>
</div>
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