Commit | Line | Data |
---|---|---|
8a7ba0dc | 1 | import urllib.parse |
8b7cf278 | 2 | from . import proto |
b409a338 FT |
3 | |
4 | __all__ = ["formdata"] | |
5 | ||
82071564 FT |
6 | def formparse(req): |
7 | buf = {} | |
8a7ba0dc | 8 | buf.update(urllib.parse.parse_qsl(req.query)) |
82071564 FT |
9 | if req.ihead.get("Content-Type") == "application/x-www-form-urlencoded": |
10 | if req.input.limit > 2 ** 20: | |
11 | raise ValueError("x-www-form-urlencoded data is absurdly long") | |
12 | rbody = req.input.read() | |
8a7ba0dc | 13 | buf.update(urllib.parse.parse_qsl(rbody)) |
82071564 | 14 | return buf |
b409a338 | 15 | |
c21c8713 FT |
16 | class badmultipart(Exception): |
17 | pass | |
18 | ||
19 | class formpart(object): | |
20 | def __init__(self, form): | |
21 | self.form = form | |
289fc162 | 22 | self.buf = b"" |
c21c8713 FT |
23 | self.eof = False |
24 | self.head = {} | |
25 | ||
26 | def parsehead(self): | |
27 | pass | |
28 | ||
29 | def fillbuf(self, sz): | |
30 | req = self.form.req | |
289fc162 FT |
31 | mboundary = b"\r\n--" + self.form.boundary + b"\r\n" |
32 | lboundary = b"\r\n--" + self.form.boundary + b"--\r\n" | |
c21c8713 FT |
33 | while not self.eof: |
34 | p = self.form.buf.find(mboundary) | |
35 | if p >= 0: | |
36 | self.buf += self.form.buf[:p] | |
37 | self.form.buf = self.form.buf[p + len(mboundary):] | |
38 | self.eof = True | |
39 | break | |
40 | p = self.form.buf.find(lboundary) | |
41 | if p >= 0: | |
42 | self.buf += self.form.buf[:p] | |
43 | self.form.buf = self.form.buf[p + len(lboundary):] | |
44 | self.eof = True | |
45 | self.form.eof = True | |
46 | break | |
47 | self.buf += self.form.buf[:-len(lboundary)] | |
48 | self.form.buf = self.form.buf[-len(lboundary):] | |
49 | if sz >= 0 and len(self.buf) >= sz: | |
50 | break | |
51 | while len(self.form.buf) <= len(lboundary): | |
0417f41c | 52 | ret = req.input.read(8192) |
c21c8713 FT |
53 | if ret == "": |
54 | raise badmultipart("Missing last multipart boundary") | |
55 | self.form.buf += ret | |
56 | ||
9bc70dab | 57 | def read(self, limit=-1): |
c21c8713 FT |
58 | self.fillbuf(limit) |
59 | if limit >= 0: | |
60 | ret = self.buf[:limit] | |
61 | self.buf = self.buf[limit:] | |
62 | else: | |
63 | ret = self.buf | |
64 | self.buf = "" | |
65 | return ret | |
66 | ||
9bc70dab | 67 | def readline(self, limit=-1): |
c21c8713 FT |
68 | last = 0 |
69 | while True: | |
289fc162 | 70 | p = self.buf.find(b'\n', last) |
c21c8713 FT |
71 | if p < 0: |
72 | if self.eof: | |
73 | ret = self.buf | |
74 | self.buf = "" | |
75 | return ret | |
76 | last = len(self.buf) | |
77 | self.fillbuf(last + 128) | |
78 | else: | |
79 | ret = self.buf[:p + 1] | |
80 | self.buf = self.buf[p + 1:] | |
81 | return ret | |
82 | ||
83 | def close(self): | |
84 | self.fillbuf(-1) | |
85 | ||
86 | def __enter__(self): | |
87 | return self | |
88 | ||
89 | def __exit__(self, *excinfo): | |
4e033e2b | 90 | self.close() |
c21c8713 FT |
91 | return False |
92 | ||
289fc162 | 93 | def parsehead(self, charset): |
c21c8713 FT |
94 | def headline(): |
95 | ln = self.readline(256) | |
289fc162 | 96 | if ln[-1] != ord(b'\n'): |
c21c8713 | 97 | raise badmultipart("Too long header line in part") |
289fc162 FT |
98 | try: |
99 | return ln.decode(charset).rstrip() | |
100 | except UnicodeError: | |
101 | raise badmultipart("Form part header is not in assumed charset") | |
c21c8713 FT |
102 | |
103 | ln = headline() | |
104 | while True: | |
105 | if ln == "": | |
106 | break | |
107 | buf = ln | |
108 | while True: | |
109 | ln = headline() | |
110 | if not ln[1:].isspace(): | |
111 | break | |
112 | buf += ln.lstrip() | |
113 | p = buf.find(':') | |
114 | if p < 0: | |
115 | raise badmultipart("Malformed multipart header line") | |
116 | self.head[buf[:p].strip().lower()] = buf[p + 1:].lstrip() | |
117 | ||
118 | val, par = proto.pmimehead(self.head.get("content-disposition", "")) | |
119 | if val != "form-data": | |
120 | raise badmultipart("Unexpected Content-Disposition in form part: %r" % val) | |
121 | if not "name" in par: | |
122 | raise badmultipart("Missing name in form part") | |
123 | self.name = par["name"] | |
124 | self.filename = par.get("filename") | |
125 | val, par = proto.pmimehead(self.head.get("content-type", "")) | |
126 | self.ctype = val | |
127 | self.charset = par.get("charset") | |
128 | encoding = self.head.get("content-transfer-encoding", "binary") | |
129 | if encoding != "binary": | |
130 | raise badmultipart("Form part uses unexpected transfer encoding: %r" % encoding) | |
131 | ||
132 | class multipart(object): | |
289fc162 | 133 | def __init__(self, req, charset): |
c21c8713 FT |
134 | val, par = proto.pmimehead(req.ihead.get("Content-Type", "")) |
135 | if req.method != "POST" or val != "multipart/form-data": | |
136 | raise badmultipart("Request is not a multipart form") | |
137 | if "boundary" not in par: | |
138 | raise badmultipart("Multipart form lacks boundary") | |
289fc162 FT |
139 | try: |
140 | self.boundary = par["boundary"].encode("us-ascii") | |
141 | except UnicodeError: | |
142 | raise badmultipart("Multipart boundary must be ASCII string") | |
c21c8713 | 143 | self.req = req |
289fc162 | 144 | self.buf = b"\r\n" |
c21c8713 | 145 | self.eof = False |
289fc162 | 146 | self.headcs = charset |
c21c8713 FT |
147 | self.lastpart = formpart(self) |
148 | self.lastpart.close() | |
149 | ||
150 | def __iter__(self): | |
151 | return self | |
152 | ||
289fc162 | 153 | def __next__(self): |
c21c8713 FT |
154 | if not self.lastpart.eof: |
155 | raise RuntimeError("All form parts must be read entirely") | |
156 | if self.eof: | |
157 | raise StopIteration() | |
158 | self.lastpart = formpart(self) | |
289fc162 | 159 | self.lastpart.parsehead(self.headcs) |
c21c8713 FT |
160 | return self.lastpart |
161 | ||
b409a338 | 162 | def formdata(req): |
82071564 | 163 | return req.item(formparse) |