python: Added PDM support in scgi-wsgi{,3}.
[ashd.git] / doc / patplex.doc
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1patplex(1)
2==========
3
4NAME
5----
6patplex - Request pattern matcher for ashd(7)
7
8SYNOPSIS
9--------
10*patplex* [*-hN*] 'CONFIGFILE'
11
12DESCRIPTION
13-----------
14
15The *patplex* handler matches requests against the rules specified in
16'CONFIGFILE', and dispatches them to the specified handlers
17accordingly. See CONFIGURATION below for a description of how requests
18are matched.
19
20*patplex* is a persistent handler, as defined in *ashd*(7).
21
22OPTIONS
23-------
24
25*-h*::
26
27 Print a brief help message to standard output and exit.
28
29*-N*::
30
31 Do not read the global configuration file `patplex.rc`.
32
33CONFIGURATION
34-------------
35
36In addition to the 'CONFIGFILE' specified on the command-line,
37*patplex* also attempts to find and read a global configuration file
38called `patplex.rc`, unless the *-N* option is given. It looks in all
39directories named by the *PATH* environment variable, appended with
40`../etc`. For example, then, if *PATH* is
41`/usr/local/bin:/bin:/usr/bin`, the directories `/usr/local/etc`,
42`/etc` and `/usr/etc` are searched for `patplex.rc`, in that
43order. Only the first file found is used, should there exist several.
44
45Should the global and the given configuration files conflict, the
46directives from the given file take precedence.
47
48The configuration files follow the same general format as for
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49*dirplex*(1), though the recognized stanzas differ. The *child*,
50*fchild* and *include* stanzas are also shared with *dirplex*(1), so
51see its manpage for a description thereof.
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52
53*patplex* recognizes the *match* stanza, which takes no arguments, but
54must contain at least one follow-up line to specify match rules. All
55rules must match for the stanza as a whole to match. The following
56rules are recognized:
57
58*point* 'REGEX' 'FLAGS'::
59
60 'REGEX' must be an extended regular expression. The rule is
61 considered to match if 'REGEX' matches the rest string of the
62 request. If 'FLAGS' contain the character `i`, 'REGEX' is
63 matched case-independently. If the *match* stanza as a whole
64 matches and contains no *restpat* line (as described below),
65 the rest string of the request is replaced by the remainder of
66 the rest string after the portion that was matched by 'REGEX'.
67
68*url* 'REGEX' 'FLAGS'::
69
70 'REGEX' must be an extended regular expression. The rule is
71 considered to match if 'REGEX' matches the raw URL of the
72 request. If 'FLAGS' contain the character `i`, 'REGEX' is
73 matched case-independently.
74
75*method* 'REGEX' 'FLAGS'::
76
77 'REGEX' must be an extended regular expression. The rule is
78 considered to match if 'REGEX' matches the HTTP method of the
79 request. If 'FLAGS' contain the character `i`, 'REGEX' is
80 matched case-independently.
81
82*header* 'HEADER' 'REGEX' 'FLAGS'::
83
84 'REGEX' must be an extended regular expression. The rule is
85 considered to match if 'REGEX' matches the named 'HEADER' in
86 the request. If the request does not contain the named
87 'HEADER', the rule never matches. If 'FLAGS' contain the
88 character `i`, 'REGEX' is matched case-independently.
89
90*default*::
91
92 Matches if and only if no *match* stanza without a *default*
93 rule has matched.
94
95In addition to the rules, a *match* stanza must contain exactly one
fda48525 96follow-up line specifying the action to take if it matches. Currently,
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97only the *handler* action is recognized:
98
99*handler* 'HANDLER'::
100
101 'HANDLER' must be a named handler as declared by a *child* or
102 *fchild* stanza, to which the request is passed.
103
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104Additionally, a *match* stanza may contain any of the following,
105optional lines:
106
107*set* 'HEADER' 'VALUE'::
108
109 If the *match* stanza as a whole matches, the named HTTP
110 'HEADER' in the request is set to 'VALUE' before passing the
111 request on to the specified handler. A *match* stanza may
112 contain any number of *set* lines.
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114*xset* 'HEADER' 'VALUE'::
115
5f746eb5 116 *xset* does exactly the same thing as *set*, except that
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117 'HEADER' is automatically prepended with the `X-Ash-`
118 prefix. The intention is only to make configuration files
119 look nicer in this very common case.
120
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121*restpat* 'TEMPLATE'::
122
123 If the *match* stanza as a whole matches, 'TEMPLATE' is
124 expanded and installed as the rest string of the request
125 before it is passed to the specified handler. In 'TEMPLATE',
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126 the following parameters are recognized and expanded. At most
127 one *restpat* line may be given per *match* stanza.
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128
129*$0* ... *$9*::
130
131 Exactly one of the *point*, *url*, *method* or *header* rules
132 specified in the *match* stanza must have the `s` character
133 among its 'FLAGS'. *$0* is replaced by the whole text that was
134 matched by the rule's 'REGEX', and any of *$1* to *$9* is
135 replaced by the corresponding parenthesized subgroup of
136 'REGEX'.
137
138*$_*::
139
140 Replaced by the entire rest string, as it was originally.
141
142*$$*::
143
144 Replaced by a single *$*.
145
146*${*'HEADER'*}*::
147
148 Replaced by the value of the named 'HEADER' in the request, or
149 the empty string if the request contained no such header.
150
151If no *match* stanza matches, a 404 response is returned to the
152client.
153
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154SIGNALS
155-------
156
157SIGHUP::
158
159 Reread the given configuration file (but not the global
160 file). If any named handlers, as specified by *child* stanzas,
161 are currently running and have stanzas with matching names in
162 the new file, they are left running for those stanzas (even if
163 the *exec* line has changed).
164
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165EXAMPLES
166--------
167
168The following configuration file serves files from the `/srv/www`
169directory by default, and in addition recognizes standard `/~user/`
170URLs as user directories and calls the *userplex*(1) program to serve
171them.
172
173--------
174child root
249cd06f 175 exec sudo -u www-data dirplex /srv/www
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176child userdir
177 exec userplex -g users
178match
179 default
180 handler root
181match
182 point ^~
183 handler userdir
184--------
185
186The following rules can be used to implement virtual hosts. The actual
187handlers are left out of the example. Note that the dots in the
188regular expressions need to be escaped with double backslashes, since
189the configuration file reader consumes one level of quoting.
190
191--------
192# Match one exact domain name only.
193match
194 header host ^www\\.foo\\.net$ i
195 handler site-foo
196# Match any sub-domain of bar.com.
197match
198 header host (^|\\.)bar\\.com$ i
199 handler site-bar
200# Use the last level of the domain name to enter a subdirectory.
201match
202 header host ^([^.]*)\\.multi\\.org$ is
249cd06f 203 restpat $1/$_
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204 handler site-multi
205--------
206
207AUTHOR
208------
209Fredrik Tolf <fredrik@dolda2000.com>
210
211SEE ALSO
212--------
213*dirplex*(1), *ashd*(7), *regex*(7)