Nginx upload module (v 2.0.7)

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A module for nginx web server for handling file uploads using multipart/form-data encoding (RFC 1867).

Description

The module parses request body storing all files being uploaded to a directory specified by upload_store directive. The files are then being stripped from body and altered request is then passed to a location specified by upload_pass directive, thus allowing arbitrary handling of uploaded files. Each of file fields are being replaced by a set of fields specified by upload_set_form_field directive. The content of each uploaded file then could be read from a file specified by $upload_tmp_path variable or the file could be simply moved to ultimate destination. Removal of output files is controlled by directive upload_cleanup.

Configuration directives

syntax: upload_pass <location>
default: none
severity: mandatory
context: server, location

Specifies location to pass request body to. File fields will be stripped and replaced by fields, containig necessary information to handle uploaded files.

syntax: upload_store <directory> [<level 1> [<level 2> ] ... ]
default: none
severity: mandatory
context: server, location

Specifies a directory to which output files will be saved to. The directory could be hashed. In this case all subdirectories should exist before starting nginx.

syntax: upload_store_access <mode>
default: user:rw
severity: optional
context: server, location

Specifies access mode which will be used to create output files.

syntax: upload_set_form_field <name> <value>
default: none
severity: optional
context: server, location

Specifies a form field(s) to generate for each uploaded file in request body passed to backend. Both name and value could contain following special variables:

$upload_field_name -- the name of original file field
$upload_content_type -- the content type of file uploaded
$upload_file_name -- the original name of the file being uploaded with leading path elements in DOS and UNIX notation stripped. I.e. "D:\Documents And Settings\My Dcouments\My Pictures\Picture.jpg" will be converted to "Picture.jpg" and "/etc/passwd" will be converted to "passwd".
$upload_tmp_path -- the path where the content of original file is being stored to. The output file name consists 10 digits and generated with the same algorithm as in proxy_temp_path directive.

These variables are valid only during processing of one part of original request body.

example:

upload_set_form_field $upload_field_name.name "$upload_file_name";
upload_set_form_field $upload_field_name.content_type "$upload_content_type";
upload_set_form_field $upload_field_name.path "$upload_tmp_path";

syntax: upload_aggregate_form_field <name> <value>
default: none
severity: optional
context: server, location

Specifies a form field(s) containing aggregate attributes to generate for each uploaded file in request body passed to backend. Both name and value could contain standard nginx variables, variables from upload_set_form_field directive and following additional special variables:

$upload_file_md5 -- MD5 checksum of the file
$upload_file_md5_uc -- MD5 checksum of the file in uppercase letters
$upload_file_sha1 -- SHA1 checksum of the file
$upload_file_sha1_uc -- SHA1 checksum of the file in uppercase letters
$upload_file_crc32 -- hexdecimal value of CRC32 of the file
$upload_file_size -- size of the file in bytes

The value of a field specified by this directive is evaluated after successful upload of the file, thus these variables are valid only at the end of processing of one part of original request body.

WARNING: variables $upload_file_md5, $upload_file_md5_uc, $upload_file_sha1 and $upload_file_sha1_uc utilize additional resourses to calculate MD5 and SHA1 checksums.

example:

upload_aggregate_form_field $upload_field_name.md5 "$upload_file_md5";
upload_aggregate_form_field $upload_field_name.size "$upload_file_size";

syntax: upload_pass_form_field <regex>
default: none
severity: optional
context: server, location

Specifies a regex pattern for names of fields which will be passed to backend from original request body. This directive could be specified multiple times per location. Field will be passed to backend as soon as first pattern matches. For PCRE-unaware enviroments this directive specifies exact name of a field to pass to backend. If directive is omitted, no fields will be passed to backend from client.

example:

upload_pass_form_field "^submit$|^description$";

For PCRE-unaware environments:

upload_pass_form_field "submit";
upload_pass_form_field "description";

syntax: upload_cleanup <HTTP status/range> [<HTTP status/range>...]
default: none
severity: optional
context: server, location

Specifies HTTP statuses after generation of which all file successfuly uploaded in current request will be removed. Used for cleanup after backend or server failure. Backend may also explicitly signal errornous status if it doesn't need uploaded files for some reason. HTTP status must be a numerical value in range 400-599, no leading zeroes are allowed. Ranges of statuses could be specified with a dash.

example:

upload_cleanup 400 404 499 500-505;

syntax: upload_buffer_size <size>
default: size of memory page in bytes
severity: optional
context: server, location

Size in bytes of write buffer which will be used to accumulate file data and write it to disk. This directive is intended to be used to compromise memory usage vs. syscall rate.

syntax: upload_max_part_header_len <size>
default: 512
severity: optional
context: server, location

Specifies maximal length of part header in bytes. Determines the size of the buffer which will be used to accumulate part headers.

syntax: upload_max_file_size <size>
default: off
severity: optional
context: main, server, location

Specifies maximal size of the file. Files longer than the value of this directive will be omitted. This directive specifies "soft" limit, in the sense, that after encountering file longer than specified limit, nginx will continue to process request body, trying to receive remaining files. For "hard" limit client_max_body_size directive must be used. The value of zero for this directive specifies that no restrictions on file size should be applied.

syntax: upload_max_output_body_len <size>
default: 100k
severity: optional
context: main, server, location

Specifies maximal length of the output body. This prevents piling up of non-file form fields in memory. Whenever output body overcomes specified limit error 413 (Request entity too large) will be generated. The value of zero for this directive specifies that no restrictions on output body length should be applied.

syntax: upload_pass_args<on/off>
default: off
severity: optional
context: main, server, location

Enables forwarding of query arguments to backend. Example:

<form action="/upload?id=5">

...

location /upload {
    upload_pass /internal_upload;
    upload_pass_args on;
}

...

location /internal_upload {
    ...
    proxy_pass http://backend;
}

In this example backend gets request URI "/upload?id=5". In case of upload_pass_args off backend gets "/upload".

Example configuration

server {
    client_max_body_size 100m;
    listen       80;

    # Upload form should be submitted to this location
    location /upload {
        # Pass altered request body to this location
        upload_pass   /test;

        # Store files to this directory
        # The directory is hashed, subdirectories 0 1 2 3 4 5 6 7 8 9 should exist
        upload_store /tmp 1;
        
        # Allow uploaded files to be read only by user
        upload_store_access user:r;

        # Set specified fields in request body
        upload_set_form_field $upload_field_name.name "$upload_file_name";
        upload_set_form_field $upload_field_name.content_type "$upload_content_type";
        upload_set_form_field $upload_field_name.path "$upload_tmp_path";

        # Inform backend about hash and size of a file
        upload_aggregate_form_field "$upload_field_name.md5" "$upload_file_md5";
        upload_aggregate_form_field "$upload_field_name.size" "$upload_file_size";

        upload_pass_form_field "^submit$|^description$";

        upload_cleanup 400 404 499 500-505;
    }

    # Pass altered request body to a backend
    location /test {
        internal;
        proxy_pass   http://localhost:8080;
    }
}

Example form

<html>
<head>
<title>Test upload</title>
</head>
<body>
<h2>Select files to upload</h2>
<form name="upload" method="POST" enctype="multipart/form-data" action="/upload">
<input type="file" name="file1"><br>
<input type="file" name="file2"><br>
<input type="file" name="file3"><br>
<input type="file" name="file4"><br>
<input type="file" name="file5"><br>
<input type="file" name="file6"><br>
<input type="submit" name="submit" value="Upload">
<input type="hidden" name="test" value="value">
</form>
</body>
</html>

Download

Latest version 2.0.7: tar.gz zip MD5 SHA1
Version 2.0.6: tar.gz zip MD5 SHA1
Version 2.0.5: tar.gz zip MD5 SHA1
Version 2.0.4: tar.gz zip MD5 SHA1
Version 2.0.3: tar.gz zip MD5 SHA1
Version 2.0.2: tar.gz zip MD5 SHA1
or go to download area

Browse repository

http://svn.myau.su/

Browse documentation for earlier versions

Version 2.0.6
Version 2.0.5
Version 2.0.4
Version 2.0.3
Version 2.0.2

How to use

Download sources from one of the links above. Unpack the archive:

tar xvzf nginx_upload_module-2.0.7.tar.gz

Configure nginx with additional module:

cd <path to nginx sources>
./configure --add-module=<path to upload module sources>
make
make install

Nginx

nginx -- is a web-server, developed by Igor Sysoev.

Licence

The above-described module is an addition to nginx web-server, nevertheless they are independent products. The licence of above-described module is BSD You should have received a copy of licence along with the source code.

Contact author

Valery Kholodkov valery+nginx@grid.net.ru
Please use address extension while composing an Email to me.

Donate

If you like this module, you can donate to it's development and support, as well as to my work in nginx addons in general.

Thank you!