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  64.           <h2>Ruby - Reading A Remote Zip File</h2>
    65. 

  65.           <span class="date">01 OCTOBER 2013</span>
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  66.           <section>
    67. 

  67.             <p>I need to access a remote zip file and this is something that works:</p>
    68. 

  68. 

  69. <div class="highlight"><pre><code class="language-ruby" data-lang="ruby"><span class="c1"># In the console, gem install &quot;httparty&quot;</span>
    70. 

  70. <span class="nb">require</span> <span class="s2">&quot;httparty&quot;</span>
    71. 

  71. 

  72. <span class="c1"># In the console, gem install &quot;rubyzip&quot;</span>
    73. 

  73. <span class="nb">require</span> <span class="s2">&quot;zip&quot;</span>
    74. 

  74. 

  75. <span class="c1"># Get the contents of the remote zip file via HTTParty</span>
    76. 

  76. <span class="c1"># and write it into a temp zip file</span>
    77. 

  77. 

  78. <span class="n">zipfile</span> <span class="o">=</span> <span class="no">Tempfile</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s2">&quot;file&quot;</span><span class="p">)</span>
    79. 

  79. <span class="n">zipfile</span><span class="o">.</span><span class="n">binmode</span> <span class="c1"># This might not be necessary depending on the zip file</span>
    80. 

  80. <span class="n">zipfile</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="no">HTTParty</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;http://localhost:3000/file.zip&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">body</span><span class="p">)</span>
    81. 

  81. <span class="n">zipfile</span><span class="o">.</span><span class="n">close</span>
    82. 

  82. 

  83. <span class="c1"># Unzip the temp zip file and process the contents</span>
    84. 

  84. <span class="c1"># Let garbage collection delete the temp zip file</span>
    85. 

  85. 

  86. <span class="no">Zip</span><span class="o">::</span><span class="no">File</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">zipfile</span><span class="o">.</span><span class="n">path</span><span class="p">)</span> <span class="k">do</span> <span class="o">|</span><span class="n">file</span><span class="o">|</span>
    87. 

  87.   <span class="n">file</span><span class="o">.</span><span class="n">each</span> <span class="k">do</span> <span class="o">|</span><span class="n">content</span><span class="o">|</span>
    88. 

  88.     <span class="n">data</span> <span class="o">=</span> <span class="n">file</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">content</span><span class="p">)</span>
    89. 

  89.     <span class="nb">puts</span> <span class="n">data</span>
    90. 

  90.     <span class="c1"># Do whatever you want with the contents</span>
    91. 

  91.   <span class="k">end</span>
    92. 

  92. <span class="k">end</span></code></pre></div>
    93. 

  93. 

  94. 

  95. <p>The code is simple, but at the start, I kept getting an error when unzipping the temp zip file,
    96. 

  96. and I thought I was doing something wrong.</p>
    97. 

  97. 

  98. <pre><code>End-of-central-directory signature not found
    99. 

  99. </code></pre>
    100. 

  100. 

  101. <p>Did some debugging and finally figured out that the problem was with the remote zip file
    102. 

  102. - because the file was not fully constructed even though I had a link to it.</p>
    103. 

  103. 

  104. <p>The remote zip file link was actually returned by an earlier API call to an external service
    105. 

  105. that also triggered the building of the remote zip file.</p>
    106. 

  106. 

  107. <p>Moral of the story? Trust my code.</p>
    108. 

  108. 

  109. <p>Anyway, <a href="http://blog.huangzhimin.com/2012/10/02/avoid-using-rubyzip/">RubyZip is poor in performance</a>. Might want to try <a href="http://zipruby.rubyforge.org/">ZipRuby</a> instead.</p>
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