1VMOD_BODYACCESS(3)                                          VMOD_BODYACCESS(3)
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NAME

6       vmod_bodyaccess - Varnish Module for request body access
7

SYNOPSIS

9          import bodyaccess [from "path"] ;
10
11          INT rematch_req_body(STRING re)
12
13          VOID hash_req_body()
14
15          INT len_req_body()
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17          VOID log_req_body(STRING prefix, INT length)
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DESCRIPTION

20       Varnish module that lets you access the request body.
21
22       VCL example:
23
24          vcl 4.0;
25          import std;
26          import bodyaccess;
27
28          backend default { .host = "192.0.2.11"; .port = "8080"; }
29
30          sub vcl_recv {
31                  if (req.method == "POST") {
32                          set req.http.x-method = req.method;
33                          if (std.cache_req_body(110KB)) {
34                                  set req.http.x-len = bodyaccess.len_req_body();
35                                  set req.http.x-re = bodyaccess.rematch_req_body("Regex");
36                                  bodyaccess.log_req_body("PREFIX:", 3);
37                          }
38                  }
39          return(hash);
40          }
41
42          sub vcl_hash {
43                  bodyaccess.hash_req_body();
44                  return (lookup);
45          }
46
47          sub vcl_backend_fetch {
48                  set bereq.method = bereq.http.x-method;
49          }
50
51          sub vcl_deliver {
52                  set resp.http.x-len = req.http.x-len;
53                  set resp.http.x-re = req.http.x-re;
54          }
55
56       N.B.  The request body must be retrieved before doing any operations on
57       it.  It can be buffered using the cache_req_body() function from  libv‐
58       mod_std.
59
60       These  functions applies only to standard REST methods.  Caching is not
61       allowed on PUT requests.
62
63   INT rematch_req_body(STRING re)
64       Description
65              Returns -1 if an error occurrs.  Returns 0 if the  request  body
66              doesn't  contain  the  string re.  Returns 1 if the request body
67              contains the string re.
68
69              Note that the comparison is case sensitive and the request  body
70              must be buffered.
71
72       Example
73
74                 | std.cache_req_body(1KB);
75                 |
76                 | if (bodyaccess.rematch_req_body("FOO") == 1) {
77                 |    std.log("is true");
78                 | }
79
80   VOID hash_req_body()
81       Description
82              Adds  available request body bytes to the lookup hash key.  Note
83              that this function can only be used in vcl_hash and the  request
84              body must be buffered.
85
86       Example
87
88                 | sub vcl_recv {
89                 |     std.cache_req_body(1KB);
90                 | }
91                 |
92                 | sub vcl_hash{
93                 |     bodyaccess.hash_req_body();
94                 | }
95
96   INT len_req_body()
97       Description
98              Returns the request body length or -1 if an error occurs.
99
100              Note that the request body must be buffered.
101
102       Example
103
104                 | std.cache_req_body(1KB);
105                 | set req.http.x-len = bodyaccess.len_req_body();
106
107   VOID log_req_body(STRING prefix="", INT length=200)
108       Description
109              Log  the  request body to the VSL, making it available for other
110              components.  When logging, it takes an optional prefix and a max
111              line length, so the body could be split up across multiple lines
112              as there is a limit to how large a single line can be.
113
114       Example
115
116                 | std.cache_req_body(1KB);
117                 | bodyaccess.log_req_body("PREFIX:", 3);
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122                                                            VMOD_BODYACCESS(3)