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<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>env</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fs</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>path</span>::<span class='ident'>PathBuf</span>;

<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ProbeResult</span> {
    <span class='kw'>pub</span> <span class='ident'>cert_file</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>PathBuf</span><span class='op'>&gt;</span>,
    <span class='kw'>pub</span> <span class='ident'>cert_dir</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>PathBuf</span><span class='op'>&gt;</span>,
}

<span class='doccomment'>/// Probe the system for the directory in which CA certificates should likely be</span>
<span class='doccomment'>/// found.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This will only search known system locations.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>find_certs_dirs</span>() <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>PathBuf</span><span class='op'>&gt;</span> {
    <span class='comment'>// see http://gagravarr.org/writing/openssl-certs/others.shtml</span>
    [
        <span class='string'>&quot;/var/ssl&quot;</span>,
        <span class='string'>&quot;/usr/share/ssl&quot;</span>,
        <span class='string'>&quot;/usr/local/ssl&quot;</span>,
        <span class='string'>&quot;/usr/local/openssl&quot;</span>,
        <span class='string'>&quot;/usr/local/share&quot;</span>,
        <span class='string'>&quot;/usr/lib/ssl&quot;</span>,
        <span class='string'>&quot;/usr/ssl&quot;</span>,
        <span class='string'>&quot;/etc/openssl&quot;</span>,
        <span class='string'>&quot;/etc/pki/tls&quot;</span>,
        <span class='string'>&quot;/etc/ssl&quot;</span>,
    ].<span class='ident'>iter</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>s</span><span class='op'>|</span> <span class='ident'>PathBuf</span>::<span class='ident'>from</span>(<span class='op'>*</span><span class='ident'>s</span>)).<span class='ident'>filter</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> {
        <span class='ident'>fs</span>::<span class='ident'>metadata</span>(<span class='ident'>p</span>).<span class='ident'>is_ok</span>()
    }).<span class='ident'>collect</span>()
}

<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>init_ssl_cert_env_vars</span>() {
    <span class='kw'>let</span> <span class='ident'>ProbeResult</span> { <span class='ident'>cert_file</span>, <span class='ident'>cert_dir</span> } <span class='op'>=</span> <span class='ident'>probe</span>();
    <span class='kw'>match</span> <span class='ident'>cert_file</span> {
        <span class='prelude-val'>Some</span>(<span class='ident'>path</span>) <span class='op'>=&gt;</span> <span class='ident'>put</span>(<span class='string'>&quot;SSL_CERT_FILE&quot;</span>, <span class='ident'>path</span>),
        <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {}
    }
    <span class='kw'>match</span> <span class='ident'>cert_dir</span> {
        <span class='prelude-val'>Some</span>(<span class='ident'>path</span>) <span class='op'>=&gt;</span> <span class='ident'>put</span>(<span class='string'>&quot;SSL_CERT_DIR&quot;</span>, <span class='ident'>path</span>),
        <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {}
    }

    <span class='kw'>fn</span> <span class='ident'>put</span>(<span class='ident'>var</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>path</span>: <span class='ident'>PathBuf</span>) {
        <span class='comment'>// Don&#39;t stomp over what anyone else has set</span>
        <span class='kw'>match</span> <span class='ident'>env</span>::<span class='ident'>var</span>(<span class='ident'>var</span>) {
            <span class='prelude-val'>Ok</span>(..) <span class='op'>=&gt;</span> {}
            <span class='prelude-val'>Err</span>(..) <span class='op'>=&gt;</span> <span class='ident'>env</span>::<span class='ident'>set_var</span>(<span class='ident'>var</span>, <span class='kw-2'>&amp;</span><span class='ident'>path</span>),
        }
    }
}

<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>probe</span>() <span class='op'>-&gt;</span> <span class='ident'>ProbeResult</span> {
    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>ProbeResult</span> {
        <span class='ident'>cert_file</span>: <span class='ident'>env</span>::<span class='ident'>var_os</span>(<span class='string'>&quot;SSL_CERT_FILE&quot;</span>).<span class='ident'>map</span>(<span class='ident'>PathBuf</span>::<span class='ident'>from</span>),
        <span class='ident'>cert_dir</span>: <span class='ident'>env</span>::<span class='ident'>var_os</span>(<span class='string'>&quot;SSL_CERT_DIR&quot;</span>).<span class='ident'>map</span>(<span class='ident'>PathBuf</span>::<span class='ident'>from</span>),
    };
    <span class='kw'>for</span> <span class='ident'>certs_dir</span> <span class='kw'>in</span> <span class='ident'>find_certs_dirs</span>().<span class='ident'>iter</span>() {
        <span class='comment'>// cert.pem looks to be an openssl 1.0.1 thing, while</span>
        <span class='comment'>// certs/ca-certificates.crt appears to be a 0.9.8 thing</span>
        <span class='kw'>for</span> <span class='ident'>cert</span> <span class='kw'>in</span> [
            <span class='string'>&quot;cert.pem&quot;</span>,
            <span class='string'>&quot;certs.pem&quot;</span>,
            <span class='string'>&quot;certs/ca-certificates.crt&quot;</span>,
            <span class='string'>&quot;certs/ca-root-nss.crt&quot;</span>
        ].<span class='ident'>iter</span>() {
            <span class='ident'>try</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>result</span>.<span class='ident'>cert_file</span>, <span class='ident'>certs_dir</span>.<span class='ident'>join</span>(<span class='ident'>cert</span>));
        }
        <span class='ident'>try</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>result</span>.<span class='ident'>cert_dir</span>, <span class='ident'>certs_dir</span>.<span class='ident'>join</span>(<span class='string'>&quot;certs&quot;</span>));
    }
    <span class='ident'>result</span>
}

<span class='kw'>fn</span> <span class='ident'>try</span>(<span class='ident'>dst</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>PathBuf</span><span class='op'>&gt;</span>, <span class='ident'>val</span>: <span class='ident'>PathBuf</span>) {
    <span class='kw'>if</span> <span class='ident'>dst</span>.<span class='ident'>is_none</span>() <span class='op'>&amp;&amp;</span> <span class='ident'>fs</span>::<span class='ident'>metadata</span>(<span class='kw-2'>&amp;</span><span class='ident'>val</span>).<span class='ident'>is_ok</span>() {
        <span class='op'>*</span><span class='ident'>dst</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>val</span>);
    }
}
</pre>
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