Nginx之CORS（Cross-Origin Resource Sharing，跨來源資源共享）來實現防止盜連多媒體資源

IT_man

tid=101068&以下是gist.github.com支援reverse proxied APIs的範例:

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# CORS header support
#
# One way to use this is by placing it into a file called "cors_support"
# under your Nginx configuration directory and placing the following
# statement inside your **location** block(s):
* B0 w9 ~5 T1 ?6 s/ w#
#   include cors_support;
* `. E' T& M9 ^: H) P#
0 p6 B1 G2 e, g% q' r; y# ~# As of Nginx 1.7.5, add_header supports an "always" parameter which
# allows CORS to work if the backend returns 4xx or 5xx status code.
#
# U" \6 I. `# k& F  D) M3 x# For more information on CORS, please see: http://enable-cors.org/
# Forked from this Gist: https://gist.github.com/michiel/1064640
! t( B  H# Y2 u4 _! f#

set $cors '';
if ($http_origin ~ '^https?://(localhost|www\.yourdomain\.com|www\.yourotherdomain\.com)$') {
        set $cors 'true';
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if ($cors = 'true') {
5 v8 D$ G. H' }/ N        add_header 'Access-Control-Allow-Origin' "$http_origin" always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
3 v+ v/ t: Q8 T  p4 v        add_header 'Access-Control-Allow-Headers' 'Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With' always;
( u1 Y6 N  b& C5 I( f        # required to be able to read Authorization header in frontend
        #add_header 'Access-Control-Expose-Headers' 'Authorization' always;
}
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8 V* j! v3 |7 |/ ]if ($request_method = 'OPTIONS') {
- J9 X% T: B) ~* Y        # Tell client that this pre-flight info is valid for 20 days
- c3 M* A- Y. ]' r2 M( ?        add_header 'Access-Control-Max-Age' 1728000;
9 A2 _" [1 |  b: C) N        add_header 'Content-Type' 'text/plain charset=UTF-8';
        add_header 'Content-Length' 0;
$ G6 L7 e  n! w+ i        return 204;
}

https://gist.github.com/Stanback/7145487#file-nginx-conf 的討論範例:

if ( $request_method !~ ^(GET|POST|HEAD|OPTIONS|PUT|PATCH|DELETE)$ ) {     return 444;
}
set $origin $http_origin;
7 M4 p0 g- H0 e* Tif ($origin !~ '^https?://(subdom1|subdom2)\.yourdom\.zone$') {
     set $origin 'https://default.yourdom.zone';
}
if ($request_method = 'OPTIONS') {
2 ~: w' C) I. X) d: U" Y4 f     add_header 'Access-Control-Allow-Origin' "$origin" always;
     add_header 'Access-Control-Allow-Methods' 'GET, POST, PATCH, PUT, DELETE, OPTIONS' always;
' ?1 w4 N2 w; \4 O, Z1 q" b; f     add_header 'Access-Control-Allow-Headers' 'Content-Type, Accept, Authorization' always;
, O1 U0 r1 D5 ?; c) U( ?     add_header 'Access-Control-Allow-Credentials' 'true' always;
7 s# N$ ^* C5 a7 D# k! a     add_header Access-Control-Max-Age 1728000;   #20 days   
- L, r6 l# G. s  L: \     add_header Content-Type 'text/plain charset=UTF-8';
     add_header Content-Length 0;
' Y6 f* W0 h& v; |! f     return 204;
) J  |" A1 ]' Y$ T- i  }}
if ($request_method ~ '(GET|POST|PATCH|PUT|DELETE)') {
3 e% x, H$ ^2 ^     add_header Access-Control-Allow-Origin "$origin" always;
     add_header Access-Control-Allow-Methods 'GET, POST, PATCH, PUT, DELETE, OPTIONS' always;
! v! Q  k  i0 t; u/ M     add_header Access-Control-Allow-Headers 'Content-Type, Accept, Authorization' always;
( U6 {3 b0 w; V3 F$ Q/ A3 K6 s     add_header Access-Control-Allow-Credentials true always;
/ P2 h9 ]: X9 b- T4 N8 H- k}

Access-Control-Allow-Origin Multiple Origin Domains? 的例子:

# based on https://gist.github.com/4165271/
#
: c0 ?! i( U' O" q) w2 _  k) B  Y# Slightly tighter CORS config for nginx
, a/ b4 ?/ W" i+ h1 i#
# A modification of https://gist.github.com/1064640/ to include a white-list of URLs
#
* K$ p" p. u& D# Despite the W3C guidance suggesting that a list of origins can be passed as part of
# Access-Control-Allow-Origin headers, several browsers (well, at least Firefox)
& p) K9 y6 Q9 h% ?# don't seem to play nicely with this.
9 A1 E) X5 J& I( F3 z#
4 ~2 q; T5 y- H0 l$ _) g9 D# l# To avoid the use of 'Access-Control-Allow-Origin: *', use a simple-ish whitelisting
# method to control access instead.
#
2 I% u/ |4 |2 d2 j% w7 l1 l# NB: This relies on the use of the 'Origin' HTTP Header.
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location / {
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: ^) `+ v; b5 `' G    if ($http_origin ~* (^https?://([^/]+\.)*(domainone|domaintwo)\.com$)) {
5 D  t! P5 e9 b+ z- m* q' q        set $cors "true";
    }
0 G* f; C; v7 E6 F5 q
    # Nginx doesn't support nested If statements. This is where things get slightly nasty.
. |" R. m* L" Y' j9 w    # Determine the HTTP request method used
    if ($request_method = 'OPTIONS') {
# L# s3 Y5 g# \( d        set $cors "${cors}options";
9 M% K/ z# o# @2 p# N% A    }
. ^% u" I6 G5 P    if ($request_method = 'GET') {
% I, Y4 U& [' {        set $cors "${cors}get";
; h' t+ F4 D9 a( M, ]    }
    if ($request_method = 'POST') {
        set $cors "${cors}post";
    }
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; N: j$ @* X5 h8 Y5 d; ~& X& ^    if ($cors = "true") {
        # Catch all incase there's a request method we're not dealing with properly
# _7 E) D# X$ a6 ]8 Y# F+ `        add_header 'Access-Control-Allow-Origin' "$http_origin";
    }

    if ($cors = "trueget") {
        add_header 'Access-Control-Allow-Origin' "$http_origin";
        add_header 'Access-Control-Allow-Credentials' 'true';
! p9 v: R2 W, b/ ?& H        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
2 V/ H" W* y) @( h! F* i    }

    if ($cors = "trueoptions") {
  c2 ?( X+ J' X" M8 r; P        add_header 'Access-Control-Allow-Origin' "$http_origin";

        #
        # Om nom nom cookies
8 l7 p+ S4 f+ J8 F        #
4 Q$ v/ [0 m6 i9 y, w        add_header 'Access-Control-Allow-Credentials' 'true';
# L& G* a; f2 G( b        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
- u. U0 Y4 V2 K
        #
        # Custom headers and headers various browsers *should* be OK with but aren't
        #
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';

        #
        # Tell client that this pre-flight info is valid for 20 days
. c1 Z2 q2 C7 ~" Z! k" w  U        #
; h1 G! p- m: V) B. F$ h  R        add_header 'Access-Control-Max-Age' 1728000;
8 p$ ?! N/ c$ u6 a& t        add_header 'Content-Type' 'text/plain charset=UTF-8';
        add_header 'Content-Length' 0;
$ ^! H9 }' R7 e, ?9 R9 M! f( J) \6 C        return 204;
    }

    if ($cors = "truepost") {
        add_header 'Access-Control-Allow-Origin' "$http_origin";
+ G# |% y5 r- U9 l( v        add_header 'Access-Control-Allow-Credentials' 'true';
* L' l  M, o0 D! |' ~3 i        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
5 d- ?* r* W+ l  j        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
    }
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