blocks|key|689946|text|GitHub+Java+API中有一个PageLinks类，用于显示如何解析Link报头。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|689947|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/eclipse/egit-github/tree/master/org.eclipse.egit.github.core|1|https://github.com/eclipse/egit-github/blob/master/org.eclipse.egit.github.core/src/org/eclipse/egit/github/core/client/PageLinks.java#L43-75^0|12|4|0|F|0|J|9|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]|$9|V|A|W|1|X]]|E|$]]|$1|F|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]]]

There is a <a href="https://github.com/eclipse/egit-github/blob/master/org.eclipse.egit.github.core/src/org/eclipse/egit/github/core/client/PageLinks.java#L43-75" rel="noreferrer">PageLinks</a> class in the <a href="https://github.com/eclipse/egit-github/tree/master/org.eclipse.egit.github.core" rel="noreferrer">GitHub Java API</a> that shows how to parse the <code>Link</code> header.

blocks|key|473895|text|我在github上找到了wombleton/link-headers。它似乎是为浏览器制作的，而不是一个npm模块，但似乎修改它以在服务器端环境中工作并不难。它使用pegjs生成真正的RFC5988解析器，而不是字符串拆分，因此它应该适用于任何链接头，而不仅仅是Github的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|473896|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/wombleton/link-headers^0|C|M|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I found <a href="https://github.com/wombleton/link-headers">wombleton/link-headers</a> on github. It appears to be made for the browser, as opposed to being an npm module, but it seems like it wouldn't be hard to modify it to work in a server-side environment. It uses pegjs to generate a real RFC 5988 parser rather than string splits, so it should work well for any link header, rather than just Github's.

blocks|key|690076|text|The+parse-link-header+NPM+module就是为了这个目的而存在的；its+source+can+be+found+on+github是在麻省理工学院的许可下(免费用于商业用途)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|690077|安装非常简单，如下所示：|690078|npm+install+parse-link-header|code-block|syntax|javascript|690079|用法如下所示：|690080|var+parse+=+require('parse-link-header');
var+parsed+=+parse('<https://api.github.com/repos?page=3&per_page=100>;+rel="next",+<https://api.github.com/repos?page=50&per_page=100>;+rel="last"')|690081|...after有parsed.next，parsed.last等的哪一个：|style|CODE|690082|{+next:
+++{+page:+'3',
+++++per_page:+'100',
+++++rel:+'next',
+++++url:+'https://api.github.com/repos?page=3&per_page=100'+},
++last:
+++{+page:+'50',
+++++per_page:+'100',
+++++rel:+'last',
+++++url:+'+https://api.github.com/repos?page=50&per_page=100'+}+}|690083|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/parse-link-header|1|https://github.com/thlorenz/parse-link-header^0|0|W|0|19|X|1|0|0|0|0|0|9|B|L|B|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]|$A|18|B|19|1|1A]]|C|$]]|$1|D|3|E|5|6|7|1B|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1C|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1D|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|1E|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|1F|8|@$A|1G|B|1H|Q|R]|$A|1I|B|1J|Q|R]]|9|@]|C|$]]|$1|S|3|T|5|H|7|1K|8|@]|9|@]|C|$I|J]]|$1|U|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|X|Y|Z|C|$10|13]]]]

<A HREF="https://www.npmjs.com/package/parse-link-header">The parse-link-header NPM module</A> exists for this purpose; <A HREF="https://github.com/thlorenz/parse-link-header">its source can be found on github</A> under a MIT license (free for commercial use).

Installation is as simple as:

<pre><code>npm install parse-link-header
</code></pre>

Usage looks like the following:

<pre><code>var parse = require('parse-link-header');
var parsed = parse('&lt;https://api.github.com/repos?page=3&amp;per_page=100&gt;; rel="next", &lt;https://api.github.com/repos?page=50&amp;per_page=100&gt;; rel="last"')
</code></pre>

...after which one has <code>parsed.next</code>, <code>parsed.last</code>, etc:

<pre><code>{ next:
 { page: '3',
 per_page: '100',
 rel: 'next',
 url: 'https://api.github.com/repos?page=3&amp;per_page=100' },
 last:
 { page: '50',
 per_page: '100',
 rel: 'last',
 url: ' https://api.github.com/repos?page=50&amp;per_page=100' } }
</code></pre>

blocks|key|690106|text|如果你可以使用Python，但又不想实现full+specification，但又需要Github+API的支持，那么我们就开始吧：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|690107|import+re
header_link+=+'<https://api.github.com/repos?page=3&per_page=100>;+rel="next",+<https://api.github.com/repos?page=50&per_page=100>;+rel="last"'
if+re.search(r';+rel="next"',+header_link):
++++print+re.sub(r'.*<(.*)>;+rel="next".*',+r'\1',+header_link)|code-block|syntax|javascript|690108|entityMap|0|LINK|mutability|MUTABLE|url|https://www.rfc-editor.org/rfc/rfc5988^0|K|I|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

If you can use Python and don't want to implement <a href="https://www.rfc-editor.org/rfc/rfc5988" rel="nofollow noreferrer">full specification</a>, but need to have something what work for Github API, then here we go:
<pre><code>import re
header_link = '&lt;https://api.github.com/repos?page=3&amp;per_page=100&gt;; rel=&quot;next&quot;, &lt;https://api.github.com/repos?page=50&amp;per_page=100&gt;; rel=&quot;last&quot;'
if re.search(r'; rel=&quot;next&quot;', header_link):
 print re.sub(r'.*&lt;(.*)&gt;; rel=&quot;next&quot;.*', r'\1', header_link)
</code></pre>

blocks|key|690134|text|下面是一个简单的bash脚本，它使用curl和sed从一个长查询中获取所有页面|type|unstyled|depth|inlineStyleRanges|entityRanges|data|690135|url="https://api.github.com/repos/$GIT_USER/$GIT_REPO/issues"
while+[+"$url"+];+do
++++++echo+"$url"+>&2
++++++curl+-Ss+-n+"$url"
++++++url="$(curl+-Ss+-I+-n+"$url"+%7C+sed+-n+-E+'s/Link:.*<(.*?)>;+rel="next".*/\1/p')"
done+>+issues.json|code-block|syntax|javascript|690136|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a simple bash script with curl and sed to get all pages from a long query

<pre><code>url="https://api.github.com/repos/$GIT_USER/$GIT_REPO/issues"
while [ "$url" ]; do
 echo "$url" &gt;&amp;2
 curl -Ss -n "$url"
 url="$(curl -Ss -I -n "$url" | sed -n -E 's/Link:.*&lt;(.*?)&gt;; rel="next".*/\1/p')"
done &gt; issues.json
</code></pre>

blocks|key|474083|text|这是一个简单的javascript函数，它用一个很好的对象符号从链接中提取有用的信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|474084|var+linkParser+=+(linkHeader)+=>+{
++let+re+=+/<([%5E\?]%2B\?[a-z]%2B=([\d]%2B))>;[\s]*rel="([a-z]%2B)"/g;
++let+arrRes+=+[];
++let+obj+=+{};
++while+((arrRes+=+re.exec(linkHeader))+!==+null)+{
++++obj[arrRes[3]]+=+{
++++++url:+arrRes[1],
++++++page:+arrRes[2]
++++};
++}
++return+obj;
}|code-block|syntax|javascript|474085|它将输出如下所示的结果==>|474086|{
++"next":+{
++++"url":+"https://api.github.com/user/9919/repos?page=2",
++++"page":+"2"
++},
++"last":+{
++++"url":+"https://api.github.com/user/9919/repos?page=10",
++++"page":+"10"
++}
}|474087|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is a simple javascript function that extracts the useful info from the link in a nice object notation.

<pre><code>var linkParser = (linkHeader) =&gt; {
 let re = /&lt;([^\?]+\?[a-z]+=([\d]+))&gt;;[\s]*rel="([a-z]+)"/g;
 let arrRes = [];
 let obj = {};
 while ((arrRes = re.exec(linkHeader)) !== null) {
 obj[arrRes[3]] = {
 url: arrRes[1],
 page: arrRes[2]
 };
 }
 return obj;
}
</code></pre>

It will output the result like this ==>

<pre><code>{
 "next": {
 "url": "https://api.github.com/user/9919/repos?page=2",
 "page": "2"
 },
 "last": {
 "url": "https://api.github.com/user/9919/repos?page=10",
 "page": "10"
 }
}
</code></pre>

blocks|key|690266|text|这是一个Python解决方案，用于计算任何github存储库的贡献者数量。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|690267|import+requests
from+urllib.parse+import+parse_qs

rsp+=+requests.head('https://api.github.com/repos/fabric8-analytics/fabric8-analytics-server/contributors?per_page=1')
contributors_count+=+parse_qs(rsp.links['last']['url'])['page'][0]|code-block|syntax|javascript|690268|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is a Python solution to get contributors count for any github repo.
<pre><code>import requests
from urllib.parse import parse_qs

rsp = requests.head('https://api.github.com/repos/fabric8-analytics/fabric8-analytics-server/contributors?per_page=1')
contributors_count = parse_qs(rsp.links['last']['url'])['page'][0]
</code></pre>

blocks|key|690308|text|下面是一个简单的代码，用于在Java+Script中解析来自GitHub的链接头|type|unstyled|depth|inlineStyleRanges|entityRanges|data|690309|var+parse+=+require('parse-link-header');
++++var+parsed+=+parse(res.headers.link);
++++no_of_pages+=+parsed.last.page;|code-block|syntax|javascript|690310|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is a simple code to parse link header from GitHub in Java Script
<pre><code>var parse = require('parse-link-header');
 var parsed = parse(res.headers.link);
 no_of_pages = parsed.last.page;
</code></pre>

blocks|key|474189|text|对于在这里用Java语言搜索Link+Header+Parser的人来说，您可以使用javax.ws.rs.core.Link。请参考下面的示例：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|474190|import+javax.ws.rs.core.Link

String+linkHeaderValue+=+"<https://api.github.com/repos?page=3&per_page=100>;+rel='next'";
Link+link+=+Link.valueOf(linkHeaderValue);|code-block|syntax|javascript|474191|entityMap^0|16|L|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

For someone who ended up here searching for Link Header Parser in Java, you can use <code>javax.ws.rs.core.Link</code>. Refer below for example:
<pre><code>import javax.ws.rs.core.Link

String linkHeaderValue = &quot;&lt;https://api.github.com/repos?page=3&amp;per_page=100&gt;; rel='next'&quot;;
Link link = Link.valueOf(linkHeaderValue);
</code></pre>

blocks|key|474238|text|这是一个Java函数，您可以找到提供的参数键和参数值的链接。请注意:这是我出于个人目的而制作的东西，对于您的场景可能不是错误的，所以请检查它并进行相应的更改|type|unstyled|depth|inlineStyleRanges|entityRanges|data|474239|https://github.com/akshaysom/LinkExtract/blob/main/LinkExtract.java|offset|length|474240|++public+static+String+getLinkFromLinkHeaderByParamAndValue(String+header,+String+param,+String+value)+{
++++++++++++if+(header+!=+null+&&+param+!=+null+&&+value+!=+null+&&+!"".equals(header.trim())+&&+!"".equals(param.trim())
++++++++++++++++++++&&+!"".equals(value))+{
++++
++++++++++++++++String[]+links+=+header.split(",");
++++
++++++++++++++++LINKS_LOOP:+for+(String+link+:+links)+{
++++
++++++++++++++++++++String[]+segments+=+link.split(";");
++++
++++++++++++++++++++if+(segments+!=+null)+{
++++
++++++++++++++++++++++++String+segmentLink+=+"";
++++
++++++++++++++++++++++++SEGMENT_LOOP:+for+(String+segment+:+segments)+{
++++++++++++++++++++++++++++segment+=+segment.trim();
++++++++++++++++++++++++++++if+(segment.startsWith("<")+&&+segment.endsWith(">"))+{
++++
++++++++++++++++++++++++++++++++segmentLink+=+segment.substring(1,+segment.length()+-+1);
++++++++++++++++++++++++++++++++continue+SEGMENT_LOOP;
++++
++++++++++++++++++++++++++++}+else+{
++++++++++++++++++++++++++++++++if+(segment.split("=").length+>+1)+{
++++
++++++++++++++++++++++++++++++++++++String+currentSegmentParam+=+segment.split("=")[0].trim();
++++++++++++++++++++++++++++++++++++String+currentSegmentValue+=+segment.split("=")[1].trim();
++++
++++++++++++++++++++++++++++++++++++if+(param.equals(currentSegmentParam)+&&+value.equals(currentSegmentValue))+{
++++++++++++++++++++++++++++++++++++++++return+segmentLink;
++++++++++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++}
++++++++++++++++++++++++}
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++++++return+null;
++++++++}|code-block|syntax|javascript|474241|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1V|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|H|7|W|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|C]]]]

This is a Java function which will serve the purpose, you can find a link for the provided parameter key and parameter value.
Please Note: This is something that I made for personal purpose, it might not be fool proof for your scenario, so review it and make changes accordingly
<a href="https://github.com/akshaysom/LinkExtract/blob/main/LinkExtract.java" rel="nofollow noreferrer">https://github.com/akshaysom/LinkExtract/blob/main/LinkExtract.java</a>
<pre><code> public static String getLinkFromLinkHeaderByParamAndValue(String header, String param, String value) {
 if (header != null &amp;&amp; param != null &amp;&amp; value != null &amp;&amp; !&quot;&quot;.equals(header.trim()) &amp;&amp; !&quot;&quot;.equals(param.trim())
 &amp;&amp; !&quot;&quot;.equals(value)) {
 
 String[] links = header.split(&quot;,&quot;);
 
 LINKS_LOOP: for (String link : links) {
 
 String[] segments = link.split(&quot;;&quot;);
 
 if (segments != null) {
 
 String segmentLink = &quot;&quot;;
 
 SEGMENT_LOOP: for (String segment : segments) {
 segment = segment.trim();
 if (segment.startsWith(&quot;&lt;&quot;) &amp;&amp; segment.endsWith(&quot;&gt;&quot;)) {
 
 segmentLink = segment.substring(1, segment.length() - 1);
 continue SEGMENT_LOOP;
 
 } else {
 if (segment.split(&quot;=&quot;).length &gt; 1) {
 
 String currentSegmentParam = segment.split(&quot;=&quot;)[0].trim();
 String currentSegmentValue = segment.split(&quot;=&quot;)[1].trim();
 
 if (param.equals(currentSegmentParam) &amp;&amp; value.equals(currentSegmentValue)) {
 return segmentLink;
 }
 }
 }
 }
 }
 }
 }
 return null;
 }
</code></pre>

the github API sends the pagination data for the json results in the http link header:

<pre><code>Link: &lt;https://api.github.com/repos?page=3&amp;per_page=100&gt;; rel="next",
&lt;https://api.github.com/repos?page=50&amp;per_page=100&gt;; rel="last"
</code></pre>

since the github API is not the only API using this method (i think) i wanted to ask if someone has a useful little snippet to parse the link header (and convert it to an array for example) so that i can use it for my js app.

i googled around but found nothing useful regarding how to parse pagination from json APIs

How to parse link header from github API

服务器

Python

GitHub

Java

github API在http链接报头中发送json结果的分页数据：Link: <https://api.github.com/repos?page=3&per_page=100>; rel="next",<https://api.github.com/repos?page=50&per_page=100>; rel=...

问如何解析来自github API的链头
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