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 "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
  34 typedef struct {
  35         PyObject_HEAD
  36         struct websrv_context *web;
  37 } web_request_Object;
  38
  39 static 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
 100 static PyMethodDef web_request_methods[] = {
 101         { "start_response", (PyCFunction)start_response, METH_VARARGS|METH_KEYWORDS, NULL },
 102         { NULL }
 103 };
 104
 105
 106 PyTypeObject 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
 114 typedef struct {
 115         PyObject_HEAD
 116 } error_Stream_Object;
 117
 118 static PyObject *py_error_flush(PyObject *self, PyObject *args, PyObject *kwargs)
 119 {
 120         /* Nothing to do here */
 121         Py_RETURN_NONE;
 122 }
 123
 124 static 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
 138 static 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
 156 static 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
 163 PyTypeObject 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
 171 typedef struct {
 172         PyObject_HEAD
 173         struct websrv_context *web;
 174         size_t offset;
 175 } input_Stream_Object;
 176
 177 static 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
 199 static PyObject *py_input_readline(PyObject *_self)
 200 {
 201         /* FIXME */
 202         PyErr_SetString(PyExc_NotImplementedError,
 203                         "readline() not yet implemented");
 204         return NULL;
 205 }
 206
 207 static 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
 221 static PyObject *py_input___iter__(PyObject *_self)
 222 {
 223         /* FIXME */
 224         PyErr_SetString(PyExc_NotImplementedError,
 225                         "__iter__() not yet implemented");
 226         return NULL;
 227 }
 228
 229 static 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
 237 PyTypeObject 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
 245 static 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
 253 static PyObject *Py_ErrorHttpStream(void)
 254 {
 255         error_Stream_Object *ret = PyObject_New(error_Stream_Object, &error_Stream_Type);
 256         return (PyObject *)ret;
 257 }
 258
 259 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)
 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
 322 static 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 = wdata->private;
 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
 368 bool 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 = py_swat;
 390         return true;
 391 }