source: vendor/3.5.0/source4/web_server/wsgi.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 11.0 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright © Jelmer Vernooij <jelmer@samba.org> 2008
5
6 Implementation of the WSGI interface described in PEP0333
7 (http://www.python.org/dev/peps/pep-0333)
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23#include "includes.h"
24#include "web_server/web_server.h"
25#include "../lib/util/dlinklist.h"
26#include "../lib/util/data_blob.h"
27#include "lib/tls/tls.h"
28#include <Python.h>
29
30#ifndef Py_RETURN_NONE
31#define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
32#endif
33
34typedef struct {
35 PyObject_HEAD
36 struct websrv_context *web;
37} web_request_Object;
38
39static PyObject *start_response(PyObject *self, PyObject *args, PyObject *kwargs)
40{
41 PyObject *response_header, *exc_info = NULL;
42 char *status;
43 int i;
44 const char *kwnames[] = {
45 "status", "response_header", "exc_info", NULL
46 };
47 web_request_Object *py_web = (web_request_Object *)self;
48 struct websrv_context *web = py_web->web;
49 struct http_header *headers = NULL;
50
51 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "sO|O:start_response", discard_const_p(char *, kwnames), &status, &response_header, &exc_info)) {
52 return NULL;
53 }
54
55 /* FIXME: exc_info */
56
57 if (!PyList_Check(response_header)) {
58 PyErr_SetString(PyExc_TypeError, "response_header should be list");
59 return NULL;
60 }
61
62 for (i = 0; i < PyList_Size(response_header); i++) {
63 struct http_header *hdr = talloc_zero(web, struct http_header);
64 PyObject *item = PyList_GetItem(response_header, i);
65 PyObject *py_name, *py_value;
66
67 if (!PyTuple_Check(item)) {
68 PyErr_SetString(PyExc_TypeError, "Expected tuple");
69 return NULL;
70 }
71
72 if (PyTuple_Size(item) != 2) {
73 PyErr_SetString(PyExc_TypeError, "header tuple has invalid size, expected 2");
74 return NULL;
75 }
76
77 py_name = PyTuple_GetItem(item, 0);
78
79 if (!PyString_Check(py_name)) {
80 PyErr_SetString(PyExc_TypeError, "header name should be string");
81 return NULL;
82 }
83
84 py_value = PyTuple_GetItem(item, 1);
85 if (!PyString_Check(py_value)) {
86 PyErr_SetString(PyExc_TypeError, "header value should be string");
87 return NULL;
88 }
89
90 hdr->name = talloc_strdup(hdr, PyString_AsString(py_name));
91 hdr->value = talloc_strdup(hdr, PyString_AsString(py_value));
92 DLIST_ADD(headers, hdr);
93 }
94
95 websrv_output_headers(web, status, headers);
96
97 Py_RETURN_NONE;
98}
99
100static PyMethodDef web_request_methods[] = {
101 { "start_response", (PyCFunction)start_response, METH_VARARGS|METH_KEYWORDS, NULL },
102 { NULL }
103};
104
105
106PyTypeObject web_request_Type = {
107 PyObject_HEAD_INIT(NULL) 0,
108 .tp_name = "wsgi.Request",
109 .tp_methods = web_request_methods,
110 .tp_basicsize = sizeof(web_request_Object),
111 .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
112};
113
114typedef struct {
115 PyObject_HEAD
116} error_Stream_Object;
117
118static PyObject *py_error_flush(PyObject *self, PyObject *args, PyObject *kwargs)
119{
120 /* Nothing to do here */
121 Py_RETURN_NONE;
122}
123
124static PyObject *py_error_write(PyObject *self, PyObject *args, PyObject *kwargs)
125{
126 const char *kwnames[] = { "str", NULL };
127 char *str = NULL;
128
129 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s:write", discard_const_p(char *, kwnames), &str)) {
130 return NULL;
131 }
132
133 DEBUG(0, ("WSGI App: %s", str));
134
135 Py_RETURN_NONE;
136}
137
138static PyObject *py_error_writelines(PyObject *self, PyObject *args, PyObject *kwargs)
139{
140 const char *kwnames[] = { "seq", NULL };
141 PyObject *seq = NULL, *item;
142
143 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O:writelines", discard_const_p(char *, kwnames), &seq)) {
144 return NULL;
145 }
146
147 while ((item = PyIter_Next(seq))) {
148 char *str = PyString_AsString(item);
149
150 DEBUG(0, ("WSGI App: %s", str));
151 }
152
153 Py_RETURN_NONE;
154}
155
156static PyMethodDef error_Stream_methods[] = {
157 { "flush", (PyCFunction)py_error_flush, METH_VARARGS|METH_KEYWORDS, NULL },
158 { "write", (PyCFunction)py_error_write, METH_VARARGS|METH_KEYWORDS, NULL },
159 { "writelines", (PyCFunction)py_error_writelines, METH_VARARGS|METH_KEYWORDS, NULL },
160 { NULL, NULL, 0, NULL }
161};
162
163PyTypeObject error_Stream_Type = {
164 PyObject_HEAD_INIT(NULL) 0,
165 .tp_name = "wsgi.ErrorStream",
166 .tp_basicsize = sizeof(error_Stream_Object),
167 .tp_methods = error_Stream_methods,
168 .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
169};
170
171typedef struct {
172 PyObject_HEAD
173 struct websrv_context *web;
174 size_t offset;
175} input_Stream_Object;
176
177static PyObject *py_input_read(PyObject *_self, PyObject *args, PyObject *kwargs)
178{
179 const char *kwnames[] = { "size", NULL };
180 PyObject *ret;
181 input_Stream_Object *self = (input_Stream_Object *)_self;
182 int size = -1;
183
184 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", discard_const_p(char *, kwnames), &size))
185 return NULL;
186
187 /* Don't read beyond buffer boundaries */
188 if (size == -1)
189 size = self->web->input.partial.length-self->offset;
190 else
191 size = MIN(size, self->web->input.partial.length-self->offset);
192
193 ret = PyString_FromStringAndSize((char *)self->web->input.partial.data+self->offset, size);
194 self->offset += size;
195
196 return ret;
197}
198
199static PyObject *py_input_readline(PyObject *_self)
200{
201 /* FIXME */
202 PyErr_SetString(PyExc_NotImplementedError,
203 "readline() not yet implemented");
204 return NULL;
205}
206
207static PyObject *py_input_readlines(PyObject *_self, PyObject *args, PyObject *kwargs)
208{
209 const char *kwnames[] = { "hint", NULL };
210 int hint;
211
212 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", discard_const_p(char *, kwnames), &hint))
213 return NULL;
214
215 /* FIXME */
216 PyErr_SetString(PyExc_NotImplementedError,
217 "readlines() not yet implemented");
218 return NULL;
219}
220
221static PyObject *py_input___iter__(PyObject *_self)
222{
223 /* FIXME */
224 PyErr_SetString(PyExc_NotImplementedError,
225 "__iter__() not yet implemented");
226 return NULL;
227}
228
229static PyMethodDef input_Stream_methods[] = {
230 { "read", (PyCFunction)py_input_read, METH_VARARGS|METH_KEYWORDS, NULL },
231 { "readline", (PyCFunction)py_input_readline, METH_NOARGS, NULL },
232 { "readlines", (PyCFunction)py_input_readlines, METH_VARARGS|METH_KEYWORDS, NULL },
233 { "__iter__", (PyCFunction)py_input___iter__, METH_NOARGS, NULL },
234 { NULL, NULL, 0, NULL }
235};
236
237PyTypeObject input_Stream_Type = {
238 PyObject_HEAD_INIT(NULL) 0,
239 .tp_name = "wsgi.InputStream",
240 .tp_basicsize = sizeof(input_Stream_Object),
241 .tp_methods = input_Stream_methods,
242 .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
243};
244
245static PyObject *Py_InputHttpStream(struct websrv_context *web)
246{
247 input_Stream_Object *ret = PyObject_New(input_Stream_Object, &input_Stream_Type);
248 ret->web = web;
249 ret->offset = 0;
250 return (PyObject *)ret;
251}
252
253static PyObject *Py_ErrorHttpStream(void)
254{
255 error_Stream_Object *ret = PyObject_New(error_Stream_Object, &error_Stream_Type);
256 return (PyObject *)ret;
257}
258
259static PyObject *create_environ(bool tls, int content_length, struct http_header *headers, const char *request_method, const char *servername, int serverport, PyObject *inputstream, const char *request_string)
260{
261 PyObject *env;
262 PyObject *errorstream;
263 PyObject *py_scheme;
264 struct http_header *hdr;
265 char *questionmark;
266
267 env = PyDict_New();
268 if (env == NULL) {
269 return NULL;
270 }
271
272 errorstream = Py_ErrorHttpStream();
273 if (errorstream == NULL) {
274 Py_DECREF(env);
275 Py_DECREF(inputstream);
276 return NULL;
277 }
278
279 PyDict_SetItemString(env, "wsgi.input", inputstream);
280 PyDict_SetItemString(env, "wsgi.errors", errorstream);
281 PyDict_SetItemString(env, "wsgi.version", Py_BuildValue("(i,i)", 1, 0));
282 PyDict_SetItemString(env, "wsgi.multithread", Py_False);
283 PyDict_SetItemString(env, "wsgi.multiprocess", Py_True);
284 PyDict_SetItemString(env, "wsgi.run_once", Py_False);
285 PyDict_SetItemString(env, "SERVER_PROTOCOL", PyString_FromString("HTTP/1.0"));
286 if (content_length > 0) {
287 PyDict_SetItemString(env, "CONTENT_LENGTH", PyLong_FromLong(content_length));
288 }
289 PyDict_SetItemString(env, "REQUEST_METHOD", PyString_FromString(request_method));
290
291 questionmark = strchr(request_string, '?');
292 if (questionmark == NULL) {
293 PyDict_SetItemString(env, "SCRIPT_NAME", PyString_FromString(request_string));
294 } else {
295 PyDict_SetItemString(env, "QUERY_STRING", PyString_FromString(questionmark+1));
296 PyDict_SetItemString(env, "SCRIPT_NAME", PyString_FromStringAndSize(request_string, questionmark-request_string));
297 }
298
299 PyDict_SetItemString(env, "SERVER_NAME", PyString_FromString(servername));
300 PyDict_SetItemString(env, "SERVER_PORT", PyInt_FromLong(serverport));
301 for (hdr = headers; hdr; hdr = hdr->next) {
302 char *name;
303 if (!strcasecmp(hdr->name, "Content-Type")) {
304 PyDict_SetItemString(env, "CONTENT_TYPE", PyString_FromString(hdr->value));
305 } else {
306 asprintf(&name, "HTTP_%s", hdr->name);
307 PyDict_SetItemString(env, name, PyString_FromString(hdr->value));
308 free(name);
309 }
310 }
311
312 if (tls) {
313 py_scheme = PyString_FromString("https");
314 } else {
315 py_scheme = PyString_FromString("http");
316 }
317 PyDict_SetItemString(env, "wsgi.url_scheme", py_scheme);
318
319 return env;
320}
321
322static void wsgi_process_http_input(struct web_server_data *wdata,
323 struct websrv_context *web)
324{
325 PyObject *py_environ, *result, *item, *iter;
326 PyObject *request_handler = (PyObject *)wdata->private_data;
327 struct socket_address *socket_address;
328
329 web_request_Object *py_web = PyObject_New(web_request_Object, &web_request_Type);
330 py_web->web = web;
331
332 socket_address = socket_get_my_addr(web->conn->socket, web);
333 py_environ = create_environ(tls_enabled(web->conn->socket),
334 web->input.content_length,
335 web->input.headers,
336 web->input.post_request?"POST":"GET",
337 socket_address->addr,
338 socket_address->port,
339 Py_InputHttpStream(web),
340 web->input.url
341 );
342 if (py_environ == NULL) {
343 DEBUG(0, ("Unable to create WSGI environment object\n"));
344 return;
345 }
346
347 result = PyObject_CallMethod(request_handler, discard_const_p(char, "__call__"), discard_const_p(char, "OO"),
348 py_environ, PyObject_GetAttrString((PyObject *)py_web, "start_response"));
349
350 if (result == NULL) {
351 DEBUG(0, ("error while running WSGI code\n"));
352 return;
353 }
354
355 iter = PyObject_GetIter(result);
356 Py_DECREF(result);
357
358 /* Now, iter over all the data returned */
359
360 while ((item = PyIter_Next(iter))) {
361 websrv_output(web, PyString_AsString(item), PyString_Size(item));
362 Py_DECREF(item);
363 }
364
365 Py_DECREF(iter);
366}
367
368bool wsgi_initialize(struct web_server_data *wdata)
369{
370 PyObject *py_swat;
371
372 Py_Initialize();
373
374 if (PyType_Ready(&web_request_Type) < 0)
375 return false;
376
377 if (PyType_Ready(&input_Stream_Type) < 0)
378 return false;
379
380 if (PyType_Ready(&error_Stream_Type) < 0)
381 return false;
382
383 wdata->http_process_input = wsgi_process_http_input;
384 py_swat = PyImport_Import(PyString_FromString("swat"));
385 if (py_swat == NULL) {
386 DEBUG(0, ("Unable to find SWAT\n"));
387 return false;
388 }
389 wdata->private_data = py_swat;
390 return true;
391}
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