source4/web_server/wsgi.c

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