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 typedef struct {
  31         PyObject_HEAD
  32         struct websrv_context *web;
  33 } web_request_Object;
  34
  35 static PyObject *start_response(PyObject *self, PyObject *args, PyObject *kwargs)
  36 {
  37         PyObject *response_header, *exc_info = NULL;
  38         char *status;
  39         int i;
  40         const char *kwnames[] = {
  41                 "status", "response_header", "exc_info", NULL
  42         };
  43         web_request_Object *py_web = (web_request_Object *)self;
  44         struct websrv_context *web = py_web->web;
  45         struct http_header *headers = NULL;
  46
  47         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "sO|O:start_response", discard_const_p(char *, kwnames), &status, &response_header, &exc_info)) {
  48                 return NULL;
  49         }
  50
  51         /* FIXME: exc_info */
  52
  53         if (!PyList_Check(response_header)) {
  54                 PyErr_SetString(PyExc_TypeError, "response_header should be list");
  55                 return NULL;
  56         }
  57
  58         for (i = 0; i < PyList_Size(response_header); i++) {
  59                 struct http_header *hdr = talloc_zero(web, struct http_header);
  60                 PyObject *item = PyList_GetItem(response_header, i);
  61                 PyObject *py_name, *py_value;
  62
  63                 if (!PyTuple_Check(item)) {
  64                         PyErr_SetString(PyExc_TypeError, "Expected tuple");
  65                         return NULL;
  66                 }
  67
  68                 if (PyTuple_Size(item) != 2) {
  69                         PyErr_SetString(PyExc_TypeError, "header tuple has invalid size, expected 2");
  70                         return NULL;
  71                 }
  72
  73                 py_name = PyTuple_GetItem(item, 0);
  74
  75                 if (!PyString_Check(py_name)) {
  76                         PyErr_SetString(PyExc_TypeError, "header name should be string");
  77                         return NULL;
  78                 }
  79
  80                 py_value = PyTuple_GetItem(item, 1);
  81                 if (!PyString_Check(py_value)) {
  82                         PyErr_SetString(PyExc_TypeError, "header value should be string");
  83                         return NULL;
  84                 }
  85
  86                 hdr->name = talloc_strdup(hdr, PyString_AsString(py_name));
  87                 hdr->value = talloc_strdup(hdr, PyString_AsString(py_value));
  88                 DLIST_ADD(headers, hdr);
  89         }
  90
  91         websrv_output_headers(web, status, headers);
  92
  93         return Py_None;
  94 }
  95
  96 static PyMethodDef web_request_methods[] = {
  97         { "start_response", (PyCFunction)start_response, METH_VARARGS|METH_KEYWORDS, NULL },
  98         { NULL }
  99 };
 100
 101
 102 PyTypeObject web_request_Type = {
 103         PyObject_HEAD_INIT(NULL) 0,
 104         .tp_name = "wsgi.Request",
 105         .tp_methods = web_request_methods,
 106         .tp_basicsize = sizeof(web_request_Object),
 107         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 108 };
 109
 110 typedef struct {
 111         PyObject_HEAD
 112 } error_Stream_Object;
 113
 114 static PyObject *py_error_flush(PyObject *self, PyObject *args, PyObject *kwargs)
 115 {
 116         /* Nothing to do here */
 117         return Py_None;
 118 }
 119
 120 static PyObject *py_error_write(PyObject *self, PyObject *args, PyObject *kwargs)
 121 {
 122         const char *kwnames[] = { "str", NULL };
 123         char *str = NULL;
 124
 125         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s:write", discard_const_p(char *, kwnames), &str)) {
 126                 return NULL;
 127         }
 128
 129         DEBUG(0, ("WSGI App: %s", str));
 130
 131         return Py_None;
 132 }
 133
 134 static PyObject *py_error_writelines(PyObject *self, PyObject *args, PyObject *kwargs)
 135 {
 136         const char *kwnames[] = { "seq", NULL };
 137         PyObject *seq = NULL, *item;
 138
 139         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O:writelines", discard_const_p(char *, kwnames), &seq)) {
 140                 return NULL;
 141         }
 142
 143         while ((item = PyIter_Next(seq))) {
 144                 char *str = PyString_AsString(item);
 145
 146                 DEBUG(0, ("WSGI App: %s", str));
 147         }
 148
 149         return Py_None;
 150 }
 151
 152 static PyMethodDef error_Stream_methods[] = {
 153         { "flush", (PyCFunction)py_error_flush, METH_VARARGS|METH_KEYWORDS, NULL },
 154         { "write", (PyCFunction)py_error_write, METH_VARARGS|METH_KEYWORDS, NULL },
 155         { "writelines", (PyCFunction)py_error_writelines, METH_VARARGS|METH_KEYWORDS, NULL },
 156         { NULL, NULL, 0, NULL }
 157 };
 158
 159 PyTypeObject error_Stream_Type = {
 160         PyObject_HEAD_INIT(NULL) 0,
 161         .tp_name = "wsgi.ErrorStream",
 162         .tp_basicsize = sizeof(error_Stream_Object),
 163         .tp_methods = error_Stream_methods,
 164         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 165 };
 166
 167 typedef struct {
 168         PyObject_HEAD
 169         struct websrv_context *web;
 170         size_t offset;
 171 } input_Stream_Object;
 172
 173 static PyObject *py_input_read(PyObject *_self, PyObject *args, PyObject *kwargs)
 174 {
 175         const char *kwnames[] = { "size", NULL };
 176         PyObject *ret;
 177         input_Stream_Object *self = (input_Stream_Object *)_self;
 178         int size = -1;
 179
 180         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", discard_const_p(char *, kwnames), &size))
 181                 return NULL;
 182
 183         /* Don't read beyond buffer boundaries */
 184         if (size == -1)
 185                 size = self->web->input.partial.length-self->offset;
 186         else
 187                 size = MIN(size, self->web->input.partial.length-self->offset);
 188
 189         ret = PyString_FromStringAndSize((char *)self->web->input.partial.data+self->offset, size);
 190         self->offset += size;
 191
 192         return ret;
 193 }
 194
 195 static PyObject *py_input_readline(PyObject *_self)
 196 {
 197         input_Stream_Object *self = (input_Stream_Object *)_self;
 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         PyObject *ret;
 208         int hint;
 209         input_Stream_Object *self = (input_Stream_Object *)_self;
 210
 211         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", discard_const_p(char *, kwnames), &hint))
 212                 return NULL;
 213
 214         /* FIXME */
 215         PyErr_SetString(PyExc_NotImplementedError,
 216                         "readlines() not yet implemented");
 217         return NULL;
 218 }
 219
 220 static PyObject *py_input___iter__(PyObject *_self)
 221 {
 222         input_Stream_Object *self = (input_Stream_Object *)_self;
 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 }