source: vendor/3.6.0/source4/web_server/wsgi.c

Last change on this file was 740, checked in by Silvan Scherrer, 13 years ago

Samba Server: update vendor to 3.6.0
File size: 11.8 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 <Python.h>
24#include "includes.h"
25#include "web_server/web_server.h"
26#include "../lib/util/dlinklist.h"
27#include "lib/tls/tls.h"
28#include "lib/tsocket/tsocket.h"
29#include "scripting/python/modules.h"
30
31/* There's no Py_ssize_t in 2.4, apparently */
32#if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 5
33typedef int Py_ssize_t;
34typedef inquiry lenfunc;
35typedef intargfunc ssizeargfunc;
36#endif
37
38typedef struct {
39 PyObject_HEAD
40 struct websrv_context *web;
41} web_request_Object;
42
43static PyObject *start_response(PyObject *self, PyObject *args, PyObject *kwargs)
44{
45 PyObject *response_header, *exc_info = NULL;
46 char *status;
47 Py_ssize_t i;
48 const char *kwnames[] = {
49 "status", "response_header", "exc_info", NULL
50 };
51 web_request_Object *py_web = (web_request_Object *)self;
52 struct websrv_context *web = py_web->web;
53 struct http_header *headers = NULL;
54
55 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "sO|O:start_response", discard_const_p(char *, kwnames), &status, &response_header, &exc_info)) {
56 return NULL;
57 }
58
59 /* FIXME: exc_info */
60
61 if (!PyList_Check(response_header)) {
62 PyErr_SetString(PyExc_TypeError, "response_header should be list");
63 return NULL;
64 }
65
66 for (i = 0; i < PyList_Size(response_header); i++) {
67 struct http_header *hdr = talloc_zero(web, struct http_header);
68 PyObject *item = PyList_GetItem(response_header, i);
69 PyObject *py_name, *py_value;
70
71 if (!PyTuple_Check(item)) {
72 PyErr_SetString(PyExc_TypeError, "Expected tuple");
73 return NULL;
74 }
75
76 if (PyTuple_Size(item) != 2) {
77 PyErr_SetString(PyExc_TypeError, "header tuple has invalid size, expected 2");
78 return NULL;
79 }
80
81 py_name = PyTuple_GetItem(item, 0);
82
83 if (!PyString_Check(py_name)) {
84 PyErr_SetString(PyExc_TypeError, "header name should be string");
85 return NULL;
86 }
87
88 py_value = PyTuple_GetItem(item, 1);
89 if (!PyString_Check(py_value)) {
90 PyErr_SetString(PyExc_TypeError, "header value should be string");
91 return NULL;
92 }
93
94 hdr->name = talloc_strdup(hdr, PyString_AsString(py_name));
95 hdr->value = talloc_strdup(hdr, PyString_AsString(py_value));
96 DLIST_ADD(headers, hdr);
97 }
98
99 websrv_output_headers(web, status, headers);
100
101 Py_RETURN_NONE;
102}
103
104static PyMethodDef web_request_methods[] = {
105 { "start_response", (PyCFunction)start_response, METH_VARARGS|METH_KEYWORDS, NULL },
106 { NULL }
107};
108
109
110PyTypeObject web_request_Type = {
111 PyObject_HEAD_INIT(NULL) 0,
112 .tp_name = "wsgi.Request",
113 .tp_methods = web_request_methods,
114 .tp_basicsize = sizeof(web_request_Object),
115 .tp_flags = Py_TPFLAGS_DEFAULT,
116};
117
118typedef struct {
119 PyObject_HEAD
120} error_Stream_Object;
121
122static PyObject *py_error_flush(PyObject *self, PyObject *args, PyObject *kwargs)
123{
124 /* Nothing to do here */
125 Py_RETURN_NONE;
126}
127
128static PyObject *py_error_write(PyObject *self, PyObject *args, PyObject *kwargs)
129{
130 const char *kwnames[] = { "str", NULL };
131 char *str = NULL;
132
133 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s:write", discard_const_p(char *, kwnames), &str)) {
134 return NULL;
135 }
136
137 DEBUG(0, ("WSGI App: %s", str));
138
139 Py_RETURN_NONE;
140}
141
142static PyObject *py_error_writelines(PyObject *self, PyObject *args, PyObject *kwargs)
143{
144 const char *kwnames[] = { "seq", NULL };
145 PyObject *seq = NULL, *item;
146
147 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O:writelines", discard_const_p(char *, kwnames), &seq)) {
148 return NULL;
149 }
150
151 while ((item = PyIter_Next(seq))) {
152 char *str = PyString_AsString(item);
153
154 DEBUG(0, ("WSGI App: %s", str));
155 }
156
157 Py_RETURN_NONE;
158}
159
160static PyMethodDef error_Stream_methods[] = {
161 { "flush", (PyCFunction)py_error_flush, METH_VARARGS|METH_KEYWORDS, NULL },
162 { "write", (PyCFunction)py_error_write, METH_VARARGS|METH_KEYWORDS, NULL },
163 { "writelines", (PyCFunction)py_error_writelines, METH_VARARGS|METH_KEYWORDS, NULL },
164 { NULL, NULL, 0, NULL }
165};
166
167PyTypeObject error_Stream_Type = {
168 PyObject_HEAD_INIT(NULL) 0,
169 .tp_name = "wsgi.ErrorStream",
170 .tp_basicsize = sizeof(error_Stream_Object),
171 .tp_methods = error_Stream_methods,
172 .tp_flags = Py_TPFLAGS_DEFAULT,
173};
174
175typedef struct {
176 PyObject_HEAD
177 struct websrv_context *web;
178 size_t offset;
179} input_Stream_Object;
180
181static PyObject *py_input_read(PyObject *_self, PyObject *args, PyObject *kwargs)
182{
183 const char *kwnames[] = { "size", NULL };
184 PyObject *ret;
185 input_Stream_Object *self = (input_Stream_Object *)_self;
186 int size = -1;
187
188 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", discard_const_p(char *, kwnames), &size))
189 return NULL;
190
191 /* Don't read beyond buffer boundaries */
192 if (size == -1)
193 size = self->web->input.partial.length-self->offset;
194 else
195 size = MIN(size, self->web->input.partial.length-self->offset);
196
197 ret = PyString_FromStringAndSize((char *)self->web->input.partial.data+self->offset, size);
198 self->offset += size;
199
200 return ret;
201}
202
203static PyObject *py_input_readline(PyObject *_self)
204{
205 /* FIXME */
206 PyErr_SetString(PyExc_NotImplementedError,
207 "readline() not yet implemented");
208 return NULL;
209}
210
211static PyObject *py_input_readlines(PyObject *_self, PyObject *args, PyObject *kwargs)
212{
213 const char *kwnames[] = { "hint", NULL };
214 int hint;
215
216 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", discard_const_p(char *, kwnames), &hint))
217 return NULL;
218
219 /* FIXME */
220 PyErr_SetString(PyExc_NotImplementedError,
221 "readlines() not yet implemented");
222 return NULL;
223}
224
225static PyObject *py_input___iter__(PyObject *_self)
226{
227 /* FIXME */
228 PyErr_SetString(PyExc_NotImplementedError,
229 "__iter__() not yet implemented");
230 return NULL;
231}
232
233static PyMethodDef input_Stream_methods[] = {
234 { "read", (PyCFunction)py_input_read, METH_VARARGS|METH_KEYWORDS, NULL },
235 { "readline", (PyCFunction)py_input_readline, METH_NOARGS, NULL },
236 { "readlines", (PyCFunction)py_input_readlines, METH_VARARGS|METH_KEYWORDS, NULL },
237 { "__iter__", (PyCFunction)py_input___iter__, METH_NOARGS, NULL },
238 { NULL, NULL, 0, NULL }
239};
240
241PyTypeObject input_Stream_Type = {
242 PyObject_HEAD_INIT(NULL) 0,
243 .tp_name = "wsgi.InputStream",
244 .tp_basicsize = sizeof(input_Stream_Object),
245 .tp_methods = input_Stream_methods,
246 .tp_flags = Py_TPFLAGS_DEFAULT,
247};
248
249static PyObject *Py_InputHttpStream(struct websrv_context *web)
250{
251 input_Stream_Object *ret = PyObject_New(input_Stream_Object, &input_Stream_Type);
252 ret->web = web;
253 ret->offset = 0;
254 return (PyObject *)ret;
255}
256
257static PyObject *Py_ErrorHttpStream(void)
258{
259 error_Stream_Object *ret = PyObject_New(error_Stream_Object, &error_Stream_Type);
260 return (PyObject *)ret;
261}
262
263static 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)
264{
265 PyObject *env;
266 PyObject *errorstream;
267 PyObject *py_scheme;
268 struct http_header *hdr;
269 char *questionmark;
270
271 env = PyDict_New();
272 if (env == NULL) {
273 return NULL;
274 }
275
276 errorstream = Py_ErrorHttpStream();
277 if (errorstream == NULL) {
278 Py_DECREF(env);
279 Py_DECREF(inputstream);
280 return NULL;
281 }
282
283 PyDict_SetItemString(env, "wsgi.input", inputstream);
284 PyDict_SetItemString(env, "wsgi.errors", errorstream);
285 PyDict_SetItemString(env, "wsgi.version", Py_BuildValue("(i,i)", 1, 0));
286 PyDict_SetItemString(env, "wsgi.multithread", Py_False);
287 PyDict_SetItemString(env, "wsgi.multiprocess", Py_True);
288 PyDict_SetItemString(env, "wsgi.run_once", Py_False);
289 PyDict_SetItemString(env, "SERVER_PROTOCOL", PyString_FromString("HTTP/1.0"));
290 if (content_length > 0) {
291 PyDict_SetItemString(env, "CONTENT_LENGTH", PyLong_FromLong(content_length));
292 }
293 PyDict_SetItemString(env, "REQUEST_METHOD", PyString_FromString(request_method));
294
295 questionmark = strchr(request_string, '?');
296 if (questionmark == NULL) {
297 PyDict_SetItemString(env, "SCRIPT_NAME", PyString_FromString(request_string));
298 } else {
299 PyDict_SetItemString(env, "QUERY_STRING", PyString_FromString(questionmark+1));
300 PyDict_SetItemString(env, "SCRIPT_NAME", PyString_FromStringAndSize(request_string, questionmark-request_string));
301 }
302
303 PyDict_SetItemString(env, "SERVER_NAME", PyString_FromString(servername));
304 PyDict_SetItemString(env, "SERVER_PORT", PyInt_FromLong(serverport));
305 for (hdr = headers; hdr; hdr = hdr->next) {
306 char *name;
307 if (!strcasecmp(hdr->name, "Content-Type")) {
308 PyDict_SetItemString(env, "CONTENT_TYPE", PyString_FromString(hdr->value));
309 } else {
310 if (asprintf(&name, "HTTP_%s", hdr->name) < 0) {
311 Py_DECREF(env);
312 Py_DECREF(inputstream);
313 PyErr_NoMemory();
314 return NULL;
315 }
316 PyDict_SetItemString(env, name, PyString_FromString(hdr->value));
317 free(name);
318 }
319 }
320
321 if (tls) {
322 py_scheme = PyString_FromString("https");
323 } else {
324 py_scheme = PyString_FromString("http");
325 }
326 PyDict_SetItemString(env, "wsgi.url_scheme", py_scheme);
327
328 return env;
329}
330
331static void wsgi_process_http_input(struct web_server_data *wdata,
332 struct websrv_context *web)
333{
334 PyObject *py_environ, *result, *item, *iter;
335 PyObject *request_handler = (PyObject *)wdata->private_data;
336 struct tsocket_address *my_address = web->conn->local_address;
337 const char *addr = "0.0.0.0";
338 uint16_t port = 0;
339 web_request_Object *py_web = PyObject_New(web_request_Object, &web_request_Type);
340 py_web->web = web;
341
342 if (tsocket_address_is_inet(my_address, "ip")) {
343 addr = tsocket_address_inet_addr_string(my_address, wdata);
344 port = tsocket_address_inet_port(my_address);
345 }
346
347 py_environ = create_environ(tls_enabled(web->conn->socket),
348 web->input.content_length,
349 web->input.headers,
350 web->input.post_request?"POST":"GET",
351 addr,
352 port,
353 Py_InputHttpStream(web),
354 web->input.url
355 );
356 if (py_environ == NULL) {
357 DEBUG(0, ("Unable to create WSGI environment object\n"));
358 return;
359 }
360
361 result = PyObject_CallMethod(request_handler, discard_const_p(char, "__call__"), discard_const_p(char, "OO"),
362 py_environ, PyObject_GetAttrString((PyObject *)py_web, "start_response"));
363
364 if (result == NULL) {
365 DEBUG(0, ("error while running WSGI code\n"));
366 return;
367 }
368
369 iter = PyObject_GetIter(result);
370 Py_DECREF(result);
371
372 /* Now, iter over all the data returned */
373
374 while ((item = PyIter_Next(iter))) {
375 websrv_output(web, PyString_AsString(item), PyString_Size(item));
376 Py_DECREF(item);
377 }
378
379 Py_DECREF(iter);
380}
381
382bool wsgi_initialize(struct web_server_data *wdata)
383{
384 PyObject *py_web_server;
385
386 Py_Initialize();
387
388 py_update_path(); /* Ensure that we have the Samba paths at
389 * the start of the sys.path() */
390
391 if (PyType_Ready(&web_request_Type) < 0)
392 return false;
393
394 if (PyType_Ready(&input_Stream_Type) < 0)
395 return false;
396
397 if (PyType_Ready(&error_Stream_Type) < 0)
398 return false;
399
400 wdata->http_process_input = wsgi_process_http_input;
401 py_web_server = PyImport_ImportModule("samba.web_server");
402 if (py_web_server == NULL) {
403 DEBUG(0, ("Unable to find web server\n"));
404 return false;
405 }
406 wdata->private_data = py_web_server;
407 return true;
408}
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