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 | 9 | if req.ihead.get("Content-Type") == "application/x-www-form-urlencoded": |
3350ac8c FT |
10 | try: |
11 | rbody = req.input.read(2 ** 20) | |
12 | except IOError as exc: | |
13 | return exc | |
118fcef7 | 14 | if len(rbody) >= 2 ** 20: |
3350ac8c | 15 | return ValueError("x-www-form-urlencoded data is absurdly long") |
3a774098 | 16 | buf.update(urllib.parse.parse_qsl(rbody.decode("latin1"))) |
82071564 | 17 | return buf |
b409a338 | 18 | |
c21c8713 FT |
19 | class badmultipart(Exception): |
20 | pass | |
21 | ||
22 | class formpart(object): | |
23 | def __init__(self, form): | |
24 | self.form = form | |
289fc162 | 25 | self.buf = b"" |
c21c8713 FT |
26 | self.eof = False |
27 | self.head = {} | |
28 | ||
29 | def parsehead(self): | |
30 | pass | |
31 | ||
32 | def fillbuf(self, sz): | |
33 | req = self.form.req | |
289fc162 FT |
34 | mboundary = b"\r\n--" + self.form.boundary + b"\r\n" |
35 | lboundary = b"\r\n--" + self.form.boundary + b"--\r\n" | |
c21c8713 FT |
36 | while not self.eof: |
37 | p = self.form.buf.find(mboundary) | |
38 | if p >= 0: | |
39 | self.buf += self.form.buf[:p] | |
40 | self.form.buf = self.form.buf[p + len(mboundary):] | |
41 | self.eof = True | |
42 | break | |
43 | p = self.form.buf.find(lboundary) | |
44 | if p >= 0: | |
45 | self.buf += self.form.buf[:p] | |
46 | self.form.buf = self.form.buf[p + len(lboundary):] | |
47 | self.eof = True | |
48 | self.form.eof = True | |
49 | break | |
50 | self.buf += self.form.buf[:-len(lboundary)] | |
51 | self.form.buf = self.form.buf[-len(lboundary):] | |
52 | if sz >= 0 and len(self.buf) >= sz: | |
53 | break | |
54 | while len(self.form.buf) <= len(lboundary): | |
0417f41c | 55 | ret = req.input.read(8192) |
1d299932 | 56 | if ret == b"": |
c21c8713 FT |
57 | raise badmultipart("Missing last multipart boundary") |
58 | self.form.buf += ret | |
59 | ||
9bc70dab | 60 | def read(self, limit=-1): |
c21c8713 FT |
61 | self.fillbuf(limit) |
62 | if limit >= 0: | |
63 | ret = self.buf[:limit] | |
64 | self.buf = self.buf[limit:] | |
65 | else: | |
66 | ret = self.buf | |
1d299932 | 67 | self.buf = b"" |
c21c8713 FT |
68 | return ret |
69 | ||
9bc70dab | 70 | def readline(self, limit=-1): |
c21c8713 FT |
71 | last = 0 |
72 | while True: | |
289fc162 | 73 | p = self.buf.find(b'\n', last) |
c21c8713 FT |
74 | if p < 0: |
75 | if self.eof: | |
76 | ret = self.buf | |
1d299932 | 77 | self.buf = b"" |
c21c8713 FT |
78 | return ret |
79 | last = len(self.buf) | |
80 | self.fillbuf(last + 128) | |
81 | else: | |
82 | ret = self.buf[:p + 1] | |
83 | self.buf = self.buf[p + 1:] | |
84 | return ret | |
85 | ||
86 | def close(self): | |
d9d1f258 FT |
87 | while True: |
88 | if self.read(8192) == b"": | |
89 | break | |
c21c8713 FT |
90 | |
91 | def __enter__(self): | |
92 | return self | |
93 | ||
94 | def __exit__(self, *excinfo): | |
4e033e2b | 95 | self.close() |
c21c8713 FT |
96 | return False |
97 | ||
289fc162 | 98 | def parsehead(self, charset): |
c21c8713 FT |
99 | def headline(): |
100 | ln = self.readline(256) | |
289fc162 | 101 | if ln[-1] != ord(b'\n'): |
c21c8713 | 102 | raise badmultipart("Too long header line in part") |
289fc162 FT |
103 | try: |
104 | return ln.decode(charset).rstrip() | |
105 | except UnicodeError: | |
106 | raise badmultipart("Form part header is not in assumed charset") | |
c21c8713 FT |
107 | |
108 | ln = headline() | |
109 | while True: | |
110 | if ln == "": | |
111 | break | |
112 | buf = ln | |
113 | while True: | |
114 | ln = headline() | |
115 | if not ln[1:].isspace(): | |
116 | break | |
117 | buf += ln.lstrip() | |
118 | p = buf.find(':') | |
119 | if p < 0: | |
120 | raise badmultipart("Malformed multipart header line") | |
121 | self.head[buf[:p].strip().lower()] = buf[p + 1:].lstrip() | |
122 | ||
123 | val, par = proto.pmimehead(self.head.get("content-disposition", "")) | |
124 | if val != "form-data": | |
125 | raise badmultipart("Unexpected Content-Disposition in form part: %r" % val) | |
126 | if not "name" in par: | |
127 | raise badmultipart("Missing name in form part") | |
128 | self.name = par["name"] | |
129 | self.filename = par.get("filename") | |
130 | val, par = proto.pmimehead(self.head.get("content-type", "")) | |
131 | self.ctype = val | |
132 | self.charset = par.get("charset") | |
133 | encoding = self.head.get("content-transfer-encoding", "binary") | |
134 | if encoding != "binary": | |
135 | raise badmultipart("Form part uses unexpected transfer encoding: %r" % encoding) | |
136 | ||
137 | class multipart(object): | |
289fc162 | 138 | def __init__(self, req, charset): |
c21c8713 FT |
139 | val, par = proto.pmimehead(req.ihead.get("Content-Type", "")) |
140 | if req.method != "POST" or val != "multipart/form-data": | |
141 | raise badmultipart("Request is not a multipart form") | |
142 | if "boundary" not in par: | |
143 | raise badmultipart("Multipart form lacks boundary") | |
289fc162 FT |
144 | try: |
145 | self.boundary = par["boundary"].encode("us-ascii") | |
146 | except UnicodeError: | |
147 | raise badmultipart("Multipart boundary must be ASCII string") | |
c21c8713 | 148 | self.req = req |
289fc162 | 149 | self.buf = b"\r\n" |
c21c8713 | 150 | self.eof = False |
289fc162 | 151 | self.headcs = charset |
c21c8713 FT |
152 | self.lastpart = formpart(self) |
153 | self.lastpart.close() | |
154 | ||
155 | def __iter__(self): | |
156 | return self | |
157 | ||
289fc162 | 158 | def __next__(self): |
c21c8713 FT |
159 | if not self.lastpart.eof: |
160 | raise RuntimeError("All form parts must be read entirely") | |
161 | if self.eof: | |
162 | raise StopIteration() | |
163 | self.lastpart = formpart(self) | |
289fc162 | 164 | self.lastpart.parsehead(self.headcs) |
c21c8713 FT |
165 | return self.lastpart |
166 | ||
3350ac8c FT |
167 | def formdata(req, onerror=Exception): |
168 | data = req.item(formparse) | |
169 | if isinstance(data, Exception): | |
170 | if onerror is Exception: | |
171 | raise data | |
172 | return onerror | |
173 | return data |