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Various set_xxx directives added to nginx's rewrite module (md5/sha1, sql/json quoting, and many more)

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Octocat-spinner-32 src
Octocat-spinner-32 t
Octocat-spinner-32 util
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Octocat-spinner-32 README
Octocat-spinner-32 config
Octocat-spinner-32 valgrind.suppress
README
Name
    ngx_set_misc - more rewrite set commands

    *This module is not distributed with the Nginx source.* See the
    installation instructions.

Status
    This module is production ready.

Synopsis

    location /foo {
        set $a $arg_a;
        set_if_empty $a 56;

        # GET /foo?a=32 will yield $a == 32
        # while GET /foo and GET /foo?a= will
        # yeild $a == 56 here.
    }

    location /bar {
        set $foo "hello\n\n'\"\\";
        set_quote_sql_str $foo $foo; # for mysql

        # OR in-place editing:
        #   set_quote_sql_str $foo;

        # now $foo is: 'hello\n\n\'\"\\'
    }

    location /bar {
        set $foo "hello\n\n'\"\\";
        set_quote_pgsql_str $foo;  # for PostgreSQL

        # now $foo is: E'hello\n\n\'\"\\'
    }

    location /json {
        set $foo "hello\n\n'\"\\";
        set_quote_json_str $foo $foo;

        # OR in-place editing:
        #   set_quote_json_str $foo;

        # now $foo is: "hello\n\n'\"\\"
    }

    location /baz {
        set $foo "hello%20world";
        set_unescape_uri $foo $foo;

        # OR in-place editing:
        #   set_unescape_uri $foo;

        # now $foo is: hello world
    }

    upstream_list universe moon sun earth;
    upstream moon { ... }
    upstream sun { ... }
    upstream earth { ... }
    location /foo {
        set_hashed_upstream $backend universe $arg_id;
        drizzle_pass $backend; # used with ngx_drizzle
    }

    location /base32 {
        set $a 'abcde';
        set_encode_base32 $a;
        set_decode_base32 $b $a;

        # now $a == 'c5h66p35' and
        # $b == 'abcde'
    }

    location /base64 {
        set $a 'abcde';
        set_encode_base64 $a;
        set_decode_base64 $b $a;

        # now $a == 'YWJjZGU=' and
        # $b == 'abcde'
    }

    location /hex {
        set $a 'abcde';
        set_encode_hex $a;
        set_decode_hex $b $a;

        # now $a == '6162636465' and
        # $b == 'abcde'
    }

    # GET /sha1 yields the output
    #   aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d
    location /sha1 {
        set_sha1 $a hello;
        echo $a;
    }

    # ditto
    location /sha1 {
        set $a hello;
        set_sha1 $a;
        echo $a;
    }

    # GET /today yields the date of today in local time using format 'yyyy-mm-dd'
    location /today {
        set_local_today $today;
        echo $today;
    }

    # GET /signature yields the hmac-sha-1 signature
    # given a secret and a string to sign
    # this example yields the base64 encoded singature which is
    # "HkADYytcoQQzqbjQX33k/ZBB/DQ="
    location /signature {
        set $secret_key 'secret-key';
        set $string_to_sign "some-string-to-sign";
        set_hmac_sha1 $signature $secret_key $string_to_sign;
        set_encode_base64 $signature $signature;
        echo $signature;
    }

    location = /rand {
        set $from 3;
        set $to 15;
        set_random $rand $from $to;

        # or write directly
        #   set_random $rand 3 15;

        echo $rand;  # will print a random integer in the range [3, 15]
    }

Description
  Every directive provided by this module can be
  mixed freely with other nginx rewrite module's
  directives, like "if" and "set". (Thanks to NDK!)

Directives
  set_if_empty

  set_quote_sql_str (can be used with ngx_array module's array_map_op)

  set_quote_pgsql_str (can be used with ngx_array module's array_map_op)


  set_quote_json_str (can be used with ngx_array module's array_map_op)

  set_unescape_uri (can be used with ngx_array module's array_map_op)

  set_escape_uri (can be used with ngx_array module's array_map_op)

  set_hashed_upstream

  set_encode_base32 (can be used with ngx_array module's array_map_op)

      RFC forces the [A-Z2-7] RFC-3548 compliant encoding, but we're using the
      "base32hex" encoding [0-9a-v].

      By default, the "=" character is used to pad the left-over bytes
      due to alignment. But the padding behavior can be completely
      disabled by setting set_misc_base32_padding off.

  set_misc_base32_padding on|off
      this directive can control whether to pad left-over bytes
      with the "=" character when encoding a base32 digest.

  set_decode_base32 (can be used with ngx_array module's array_map_op)
      RFC forces the [A-Z2-7] RFC-3548 compliant encoding, but we're using the
      "base32hex" encoding [0-9a-v].

  set_encode_base64

  set_decode_base64

  set_encode_hex

  set_decode_hex

  set_sha1 (can be used with ngx_array module's array_map_op)

  set_md5 (can be used with ngx_array module's array_map_op and ngx_lua's ndk.set_var)

  set_local_today

  set_hmac_sha1 (only enabled when nginx uses openssl, as with ssl support)

  set_random $res <from> <to>
    Note that only non-negative numbers in the "from" to "to" argument are allowed.
    A (psuedo) random number in the range [<from>, <to>] (inclusive) will be assigned
    to $res. For now, there's no way to configure a custom random generator seed.
    Behind the scene, it makes use of the standard C function rand().

Caveats
    Do not use $arg_XXX or $http_XXX or other special variables defined in
    the nginx core module as the target variable in this module's directives.
    For instance,

        set_if_empty $arg_user 'foo';  # DO NOT USE THIS!

    will lead to data corruption.

Installation
    1. Grab the nginx source code from nginx.net (<http://nginx.net/ >), for
        example, the version 0.8.54 (see nginx compatibility),

    2. Grab the NDK module from GitHub:
        http://github.com/simpl/ngx_devel_kit

    3. and then build the source with this module:

        $ wget 'http://sysoev.ru/nginx/nginx-0.8.54.tar.gz'
        $ tar -xzvf nginx-0.8.54.tar.gz
        $ cd nginx-0.8.54/

        # Here we assume you would install you nginx under /opt/nginx/.
        $ ./configure --prefix=/opt/nginx \
            --add-module=/path/to/ngx_devel_kit \
            --add-module=/path/to/set-misc-nginx-module

        $ make -j2
        $ make install

    Download the latest version of the release tarball of this module from
    set-misc-nginx-module file list
    (<http://github.com/agentzh/set-misc-nginx-module/downloads >).

Compatibility
    The following versions of Nginx should work with this module:

    *   1.0.x (last tested: 1.0.2)

    *   0.9.x (last tested: 0.9.4)

    *   0.8.x (last tested: 0.8.54)

    *   0.7.x >= 0.7.46 (last tested: 0.7.68)

    Earlier versions of Nginx like 0.6.x and 0.5.x will *not* work.

    If you find that any particular version of Nginx above 0.7.44 does not
    work with this module, please consider reporting a bug.

Report Bugs
    Although a lot of effort has been put into testing and code tuning,
    there must be some serious bugs lurking somewhere in this module. So
    whenever you are bitten by any quirks, please don't hesitate to

    1.  send a bug report or even patches to <agentzh@gmail.com>,

    2.  or create a ticket on the issue tracking interface
        (<http://github.com/agentzh/set-misc-nginx-module/issues >)
        provided by GitHub.

Source Repository
    Available on github at agentzh/set-misc-nginx-module
    (<http://github.com/agentzh/set-misc-nginx-module >).

ChangeLog

Test Suite
    This module comes with a Perl-driven test suite. The test cases
    (<http://github.com/agentzh/set-misc-nginx-module/tree/master/test/t/ >)
    are declarative
    (<http://github.com/agentzh/set-misc-nginx-module/blob/master/test/t/sanity.t >
    ) too. Thanks to the Test::Base
    (<http://search.cpan.org/perldoc?Test::Base >) module in the Perl world.

    To run it on your side:

        $ cd test
        $ PATH=/path/to/your/nginx-with-set-misc-module:$PATH prove -r t

    You need to terminate any Nginx processes before running the test suite
    if you have changed the Nginx server binary.

    Test::Nginx (<http://search.cpan.org/perldoc?Test::Nginx >) is used by
    the test scaffold.

    Because a single nginx server (by default, "localhost:1984") is used
    across all the test scripts (".t" files), it's meaningless to run the
    test suite in parallel by specifying "-jN" when invoking the "prove"
    utility.

    Some parts of the test suite requires modules rewrite, and echo
    to be enabled as well when building Nginx.

TODO

Getting involved
    You'll be very welcomed to submit patches to the author or just ask for
    a commit bit to the source repository on GitHub.

Author
    agentzh (章亦春) *<agentzh@gmail.com>*

Copyright & License
    Copyright (c) 2010, Taobao Inc., Alibaba Group ( http://www.taobao.com
    ).

    Copyright (c) 2009, agentzh <agentzh@gmail.com>.

    This module is licensed under the terms of the BSD license.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

    *   Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

    *   Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
    IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
    PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
    TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

See Also
    NDK: http://github.com/simpl/ngx_devel_kit
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