compact formatting of json
[src/app-framework-binder.git] / src / afb-hreq.c
index 613d419..ab174e2 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 IoT.bzh
+ * Copyright (C) 2016 "IoT.bzh"
  * Author: José Bollo <jose.bollo@iot.bzh>
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  */
 
 #define _GNU_SOURCE
-#include <microhttpd.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 #include <assert.h>
-#include <poll.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <sys/stat.h>
 
-#include "../include/local-def.h"
+#include <microhttpd.h>
+#include <json-c/json.h>
+
+#if defined(USE_MAGIC_MIME_TYPE)
+#include <magic.h>
+#endif
+
 #include "afb-method.h"
-#include "afb-req-itf.h"
+#include <afb/afb-req-itf.h>
+#include "afb-msg-json.h"
+#include "afb-context.h"
 #include "afb-hreq.h"
+#include "session.h"
+#include "verbose.h"
 
-static char empty_string[1] = "";
+#define SIZE_RESPONSE_BUFFER   8192
 
+static char empty_string[] = "";
+
+static const char long_key_for_uuid[] = "x-afb-uuid";
+static const char short_key_for_uuid[] = "uuid";
+
+static const char long_key_for_token[] = "x-afb-token";
+static const char short_key_for_token[] = "token";
+
+static const char long_key_for_reqid[] = "x-afb-reqid";
+static const char short_key_for_reqid[] = "reqid";
+
+static char *cookie_name = NULL;
+static char *cookie_setter = NULL;
+static char *tmp_pattern = NULL;
+
+/*
+ * Structure for storing key/values read from POST requests
+ */
+struct hreq_data {
+       struct hreq_data *next; /* chain to next data */
+       char *key;              /* key name */
+       size_t length;          /* length of the value (used for appending) */
+       char *value;            /* the value (or original filename) */
+       char *path;             /* path of the file saved */
+};
+
+static struct json_object *req_json(struct afb_hreq *hreq);
+static struct afb_arg req_get(struct afb_hreq *hreq, const char *name);
+static void req_fail(struct afb_hreq *hreq, const char *status, const char *info);
+static void req_success(struct afb_hreq *hreq, json_object *obj, const char *info);
+static const char *req_raw(struct afb_hreq *hreq, size_t *size);
+static void req_send(struct afb_hreq *hreq, const char *buffer, size_t size);
+
+static const struct afb_req_itf afb_hreq_itf = {
+       .json = (void*)req_json,
+       .get = (void*)req_get,
+       .success = (void*)req_success,
+       .fail = (void*)req_fail,
+       .raw = (void*)req_raw,
+       .send = (void*)req_send,
+       .context_get = (void*)afb_context_get,
+       .context_set = (void*)afb_context_set,
+       .addref = (void*)afb_hreq_addref,
+       .unref = (void*)afb_hreq_unref,
+       .session_close = (void*)afb_context_close,
+       .session_set_LOA = (void*)afb_context_change_loa
+};
+
+static struct hreq_data *get_data(struct afb_hreq *hreq, const char *key, int create)
+{
+       struct hreq_data *data = hreq->data;
+       while (data != NULL) {
+               if (!strcasecmp(data->key, key))
+                       return data;
+               data = data->next;
+       }
+       if (create) {
+               data = calloc(1, sizeof *data);
+               if (data != NULL) {
+                       data->key = strdup(key);
+                       if (data->key == NULL) {
+                               free(data);
+                               data = NULL;
+                       } else {
+                               data->next = hreq->data;
+                               hreq->data = data;
+                       }
+               }
+       }
+       return data;
+}
 
 /* a valid subpath is a relative path not looking deeper than root using .. */
 static int validsubpath(const char *subpath)
@@ -66,8 +151,178 @@ static int validsubpath(const char *subpath)
        return 1;
 }
 
+static void afb_hreq_reply_v(struct afb_hreq *hreq, unsigned status, struct MHD_Response *response, va_list args)
+{
+       char *cookie;
+       const char *k, *v;
+
+       if (hreq->replied != 0)
+               return;
+
+       k = va_arg(args, const char *);
+       while (k != NULL) {
+               v = va_arg(args, const char *);
+               MHD_add_response_header(response, k, v);
+               k = va_arg(args, const char *);
+       }
+       v = afb_context_sent_uuid(&hreq->context);
+       if (v != NULL && asprintf(&cookie, cookie_setter, v) > 0) {
+               MHD_add_response_header(response, MHD_HTTP_HEADER_SET_COOKIE, cookie);
+               free(cookie);
+       }
+       MHD_queue_response(hreq->connection, status, response);
+       MHD_destroy_response(response);
+
+       hreq->replied = 1;
+       if (hreq->suspended != 0) {
+               extern void run_micro_httpd(struct afb_hsrv *hsrv);
+               MHD_resume_connection (hreq->connection);
+               hreq->suspended = 0;
+               run_micro_httpd(hreq->hsrv);
+       }
+}
+
+void afb_hreq_reply(struct afb_hreq *hreq, unsigned status, struct MHD_Response *response, ...)
+{
+       va_list args;
+       va_start(args, response);
+       afb_hreq_reply_v(hreq, status, response, args);
+       va_end(args);
+}
+
+void afb_hreq_reply_empty(struct afb_hreq *hreq, unsigned status, ...)
+{
+       va_list args;
+       va_start(args, status);
+       afb_hreq_reply_v(hreq, status, MHD_create_response_from_buffer(0, NULL, MHD_RESPMEM_PERSISTENT), args);
+       va_end(args);
+}
+
+void afb_hreq_reply_static(struct afb_hreq *hreq, unsigned status, size_t size, const char *buffer, ...)
+{
+       va_list args;
+       va_start(args, buffer);
+       afb_hreq_reply_v(hreq, status, MHD_create_response_from_buffer((unsigned)size, (char*)buffer, MHD_RESPMEM_PERSISTENT), args);
+       va_end(args);
+}
+
+void afb_hreq_reply_copy(struct afb_hreq *hreq, unsigned status, size_t size, const char *buffer, ...)
+{
+       va_list args;
+       va_start(args, buffer);
+       afb_hreq_reply_v(hreq, status, MHD_create_response_from_buffer((unsigned)size, (char*)buffer, MHD_RESPMEM_MUST_COPY), args);
+       va_end(args);
+}
+
+void afb_hreq_reply_free(struct afb_hreq *hreq, unsigned status, size_t size, char *buffer, ...)
+{
+       va_list args;
+       va_start(args, buffer);
+       afb_hreq_reply_v(hreq, status, MHD_create_response_from_buffer((unsigned)size, buffer, MHD_RESPMEM_MUST_FREE), args);
+       va_end(args);
+}
+
+#if defined(USE_MAGIC_MIME_TYPE)
+
+#if !defined(MAGIC_DB)
+#define MAGIC_DB "/usr/share/misc/magic.mgc"
+#endif
+
+static magic_t lazy_libmagic()
+{
+       static int done = 0;
+       static magic_t result = NULL;
+
+       if (!done) {
+               done = 1;
+               /* MAGIC_MIME tells magic to return a mime of the file,
+                        but you can specify different things */
+               INFO("Loading mimetype default magic database");
+               result = magic_open(MAGIC_MIME_TYPE);
+               if (result == NULL) {
+                       ERROR("unable to initialize magic library");
+               }
+               /* Warning: should not use NULL for DB
+                               [libmagic bug wont pass efence check] */
+               else if (magic_load(result, MAGIC_DB) != 0) {
+                       ERROR("cannot load magic database: %s", magic_error(result));
+                       magic_close(result);
+                       result = NULL;
+               }
+       }
+
+       return result;
+}
+
+static const char *magic_mimetype_fd(int fd)
+{
+       magic_t lib = lazy_libmagic();
+       return lib ? magic_descriptor(lib, fd) : NULL;
+}
+
+#endif
+
+static const char *mimetype_fd_name(int fd, const char *filename)
+{
+       const char *result = NULL;
+
+#if defined(INFER_EXTENSION)
+       const char *extension = strrchr(filename, '.');
+       if (extension) {
+               static const char *const known[][2] = {
+                       { ".js",   "text/javascript" },
+                       { ".html", "text/html" },
+                       { ".css",  "text/css" },
+                       { NULL, NULL }
+               };
+               int i = 0;
+               while (known[i][0]) {
+                       if (!strcasecmp(extension, known[i][0])) {
+                               result = known[i][1];
+                               break;
+                       }
+                       i++;
+               }
+       }
+#endif
+#if defined(USE_MAGIC_MIME_TYPE)
+       if (result == NULL)
+               result = magic_mimetype_fd(fd);
+#endif
+       return result;
+}
+
+void afb_hreq_addref(struct afb_hreq *hreq)
+{
+       hreq->refcount++;
+}
+
+void afb_hreq_unref(struct afb_hreq *hreq)
+{
+       struct hreq_data *data;
+
+       if (hreq == NULL || --hreq->refcount)
+               return;
+
+       if (hreq->postform != NULL)
+               MHD_destroy_post_processor(hreq->postform);
+       for (data = hreq->data; data; data = hreq->data) {
+               hreq->data = data->next;
+               if (data->path) {
+                       unlink(data->path);
+                       free(data->path);
+               }
+               free(data->key);
+               free(data->value);
+               free(data);
+       }
+       afb_context_disconnect(&hreq->context);
+       json_object_put(hreq->json);
+       free(hreq);
+}
+
 /*
- * Removes the 'prefix' of 'length' frome the tail of 'hreq'
+ * Removes the 'prefix' of 'length' from the tail of 'hreq'
  * if and only if the prefix exists and is terminated by a leading
  * slash
  */
@@ -75,7 +330,7 @@ int afb_hreq_unprefix(struct afb_hreq *hreq, const char *prefix, size_t length)
 {
        /* check the prefix ? */
        if (length > hreq->lentail || (hreq->tail[length] && hreq->tail[length] != '/')
-           || memcmp(prefix, hreq->tail, length))
+           || strncasecmp(prefix, hreq->tail, length))
                return 0;
 
        /* removes successives / */
@@ -95,20 +350,7 @@ int afb_hreq_valid_tail(struct afb_hreq *hreq)
 
 void afb_hreq_reply_error(struct afb_hreq *hreq, unsigned int status)
 {
-       char *buffer;
-       int length;
-       struct MHD_Response *response;
-
-       length = asprintf(&buffer, "<html><body>error %u</body></html>", status);
-       if (length > 0)
-               response = MHD_create_response_from_buffer((unsigned)length, buffer, MHD_RESPMEM_MUST_FREE);
-       else {
-               buffer = "<html><body>error</body></html>";
-               response = MHD_create_response_from_buffer(strlen(buffer), buffer, MHD_RESPMEM_PERSISTENT);
-       }
-       if (!MHD_queue_response(hreq->connection, status, response))
-               fprintf(stderr, "Failed to reply error code %u", status);
-       MHD_destroy_response(response);
+       afb_hreq_reply_empty(hreq, status, NULL);
 }
 
 int afb_hreq_reply_file_if_exist(struct afb_hreq *hreq, int dirfd, const char *filename)
@@ -120,14 +362,23 @@ int afb_hreq_reply_file_if_exist(struct afb_hreq *hreq, int dirfd, const char *f
        char etag[1 + 2 * sizeof(int)];
        const char *inm;
        struct MHD_Response *response;
+       const char *mimetype;
 
        /* Opens the file or directory */
-       fd = openat(dirfd, filename, O_RDONLY);
-       if (fd < 0) {
-               if (errno == ENOENT)
-                       return 0;
-               afb_hreq_reply_error(hreq, MHD_HTTP_FORBIDDEN);
-               return 1;
+       if (filename[0]) {
+               fd = openat(dirfd, filename, O_RDONLY);
+               if (fd < 0) {
+                       if (errno == ENOENT)
+                               return 0;
+                       afb_hreq_reply_error(hreq, MHD_HTTP_FORBIDDEN);
+                       return 1;
+               }
+       } else {
+               fd = dup(dirfd);
+               if (fd < 0) {
+                       afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
+                       return 1;
+               }
        }
 
        /* Retrieves file's status */
@@ -139,15 +390,24 @@ int afb_hreq_reply_file_if_exist(struct afb_hreq *hreq, int dirfd, const char *f
 
        /* serve directory */
        if (S_ISDIR(st.st_mode)) {
-               if (hreq->url[hreq->lenurl - 1] != '/') {
-                       /* the redirect is needed for reliability of relative path */
-                       char *tourl = alloca(hreq->lenurl + 2);
-                       memcpy(tourl, hreq->url, hreq->lenurl);
-                       tourl[hreq->lenurl] = '/';
-                       tourl[hreq->lenurl + 1] = 0;
-                       rc = afb_hreq_redirect_to(hreq, tourl);
-               } else {
-                       rc = afb_hreq_reply_file_if_exist(hreq, fd, "index.html");
+               static const char *indexes[] = { "index.html", NULL };
+               int i = 0;
+               rc = 0;
+               while (indexes[i] != NULL) {
+                       if (faccessat(fd, indexes[i], R_OK, 0) == 0) {
+                               if (hreq->url[hreq->lenurl - 1] != '/') {
+                                       /* the redirect is needed for reliability of relative path */
+                                       char *tourl = alloca(hreq->lenurl + 2);
+                                       memcpy(tourl, hreq->url, hreq->lenurl);
+                                       tourl[hreq->lenurl] = '/';
+                                       tourl[hreq->lenurl + 1] = 0;
+                                       rc = afb_hreq_redirect_to(hreq, tourl);
+                               } else {
+                                       rc = afb_hreq_reply_file_if_exist(hreq, fd, indexes[i]);
+                               }
+                               break;
+                       }
+                       i++;
                }
                close(fd);
                return rc;
@@ -175,8 +435,7 @@ int afb_hreq_reply_file_if_exist(struct afb_hreq *hreq, int dirfd, const char *f
        if (inm && 0 == strcmp(inm, etag)) {
                /* etag ok, return NOT MODIFIED */
                close(fd);
-               if (verbose)
-                       fprintf(stderr, "Not Modified: [%s]\n", filename);
+               DEBUG("Not Modified: [%s]", filename);
                response = MHD_create_response_from_buffer(0, empty_string, MHD_RESPMEM_PERSISTENT);
                status = MHD_HTTP_NOT_MODIFIED;
        } else {
@@ -191,21 +450,17 @@ int afb_hreq_reply_file_if_exist(struct afb_hreq *hreq, int dirfd, const char *f
                response = MHD_create_response_from_fd((size_t) st.st_size, fd);
                status = MHD_HTTP_OK;
 
-#if defined(USE_MAGIC_MIME_TYPE)
                /* set the type */
-               if (hreq->session->magic) {
-                       const char *mimetype = magic_descriptor(hreq->session->magic, fd);
-                       if (mimetype != NULL)
-                               MHD_add_response_header(response, MHD_HTTP_HEADER_CONTENT_TYPE, mimetype);
-               }
-#endif
+               mimetype = mimetype_fd_name(fd, filename);
+               if (mimetype != NULL)
+                       MHD_add_response_header(response, MHD_HTTP_HEADER_CONTENT_TYPE, mimetype);
        }
 
        /* fills the value and send */
-       MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL, hreq->session->cacheTimeout);
-       MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etag);
-       MHD_queue_response(hreq->connection, status, response);
-       MHD_destroy_response(response);
+       afb_hreq_reply(hreq, status, response,
+                       MHD_HTTP_HEADER_CACHE_CONTROL, hreq->cacheTimeout,
+                       MHD_HTTP_HEADER_ETAG, etag,
+                       NULL);
        return 1;
 }
 
@@ -219,14 +474,10 @@ int afb_hreq_reply_file(struct afb_hreq *hreq, int dirfd, const char *filename)
 
 int afb_hreq_redirect_to(struct afb_hreq *hreq, const char *url)
 {
-       struct MHD_Response *response;
-
-       response = MHD_create_response_from_buffer(0, empty_string, MHD_RESPMEM_PERSISTENT);
-       MHD_add_response_header(response, MHD_HTTP_HEADER_LOCATION, url);
-       MHD_queue_response(hreq->connection, MHD_HTTP_MOVED_PERMANENTLY, response);
-       MHD_destroy_response(response);
-       if (verbose)
-               fprintf(stderr, "redirect from [%s] to [%s]\n", hreq->url, url);
+       /* TODO: append the query part! */
+       afb_hreq_reply_static(hreq, MHD_HTTP_MOVED_PERMANENTLY, 0, NULL,
+                       MHD_HTTP_HEADER_LOCATION, url, NULL);
+       DEBUG("redirect from [%s] to [%s]", hreq->url, url);
        return 1;
 }
 
@@ -237,11 +488,273 @@ const char *afb_hreq_get_cookie(struct afb_hreq *hreq, const char *name)
 
 const char *afb_hreq_get_argument(struct afb_hreq *hreq, const char *name)
 {
-       return MHD_lookup_connection_value(hreq->connection, MHD_GET_ARGUMENT_KIND, name);
+       struct hreq_data *data = get_data(hreq, name, 0);
+       return data ? data->value : MHD_lookup_connection_value(hreq->connection, MHD_GET_ARGUMENT_KIND, name);
+}
+
+const char *afb_hreq_get_header(struct afb_hreq *hreq, const char *name)
+{
+       return MHD_lookup_connection_value(hreq->connection, MHD_HEADER_KIND, name);
+}
+
+int afb_hreq_post_add(struct afb_hreq *hreq, const char *key, const char *data, size_t size)
+{
+       void *p;
+       struct hreq_data *hdat = get_data(hreq, key, 1);
+       if (hdat->path != NULL) {
+               return 0;
+       }
+       p = realloc(hdat->value, hdat->length + size + 1);
+       if (p == NULL) {
+               return 0;
+       }
+       hdat->value = p;
+       memcpy(&hdat->value[hdat->length], data, size);
+       hdat->length += size;
+       hdat->value[hdat->length] = 0;
+       return 1;
+}
+
+int afb_hreq_init_download_path(const char *directory)
+{
+       struct stat st;
+       size_t n;
+       char *p;
+
+       if (access(directory, R_OK|W_OK)) {
+               /* no read/write access */
+               return -1;
+       }
+       if (stat(directory, &st)) {
+               /* can't get info */
+               return -1;
+       }
+       if (!S_ISDIR(st.st_mode)) {
+               /* not a directory */
+               errno = ENOTDIR;
+               return -1;
+       }
+       n = strlen(directory);
+       while(n > 1 && directory[n-1] == '/') n--;
+       p = malloc(n + 8);
+       if (p == NULL) {
+               /* can't allocate memory */
+               errno = ENOMEM;
+               return -1;
+       }
+       memcpy(p, directory, n);
+       p[n++] = '/';
+       p[n++] = 'X';
+       p[n++] = 'X';
+       p[n++] = 'X';
+       p[n++] = 'X';
+       p[n++] = 'X';
+       p[n++] = 'X';
+       p[n] = 0;
+       free(tmp_pattern);
+       tmp_pattern = p;
+       return 0;
+}
+
+static int opentempfile(char **path)
+{
+       int fd;
+       char *fname;
+
+       fname = strdup(tmp_pattern ? : "XXXXXX"); /* TODO improve the path */
+       if (fname == NULL)
+               return -1;
+
+       fd = mkostemp(fname, O_CLOEXEC|O_WRONLY);
+       if (fd < 0)
+               free(fname);
+       else
+               *path = fname;
+       return fd;
+}
+
+int afb_hreq_post_add_file(struct afb_hreq *hreq, const char *key, const char *file, const char *data, size_t size)
+{
+       int fd;
+       ssize_t sz;
+       struct hreq_data *hdat = get_data(hreq, key, 1);
+
+       if (hdat->value == NULL) {
+               hdat->value = strdup(file);
+               if (hdat->value == NULL)
+                       return 0;
+               fd = opentempfile(&hdat->path);
+       } else if (strcmp(hdat->value, file) || hdat->path == NULL) {
+               return 0;
+       } else {
+               fd = open(hdat->path, O_WRONLY|O_APPEND);
+       }
+       if (fd < 0)
+               return 0;
+       while (size) {
+               sz = write(fd, data, size);
+               if (sz >= 0) {
+                       hdat->length += (size_t)sz;
+                       size -= (size_t)sz;
+                       data += sz;
+               } else if (errno != EINTR)
+                       break;
+       }
+       close(fd);
+       return !size;
+}
+
+struct afb_req afb_hreq_to_req(struct afb_hreq *hreq)
+{
+       return (struct afb_req){ .itf = &afb_hreq_itf, .closure = hreq };
+}
+
+static struct afb_arg req_get(struct afb_hreq *hreq, const char *name)
+{
+       const char *value;
+       struct hreq_data *hdat = get_data(hreq, name, 0);
+       if (hdat)
+               return (struct afb_arg){
+                       .name = hdat->key,
+                       .value = hdat->value,
+                       .path = hdat->path
+               };
+
+       value = MHD_lookup_connection_value(hreq->connection, MHD_GET_ARGUMENT_KIND, name);
+       return (struct afb_arg){
+               .name = value == NULL ? NULL : name,
+               .value = value,
+               .path = NULL
+       };
+}
+
+static int _iterargs_(struct json_object *obj, enum MHD_ValueKind kind, const char *key, const char *value)
+{
+       json_object_object_add(obj, key, value ? json_object_new_string(value) : NULL);
+       return 1;
+}
+
+static struct json_object *req_json(struct afb_hreq *hreq)
+{
+       struct hreq_data *hdat;
+       struct json_object *obj, *val;
+
+       obj = hreq->json;
+       if (obj == NULL) {
+               hreq->json = obj = json_object_new_object();
+               if (obj == NULL) {
+               } else {
+                       MHD_get_connection_values (hreq->connection, MHD_GET_ARGUMENT_KIND, (void*)_iterargs_, obj);
+                       for (hdat = hreq->data ; hdat ; hdat = hdat->next) {
+                               if (hdat->path == NULL)
+                                       val = hdat->value ? json_object_new_string(hdat->value) : NULL;
+                               else {
+                                       val = json_object_new_object();
+                                       if (val == NULL) {
+                                       } else {
+                                               json_object_object_add(val, "file", json_object_new_string(hdat->value));
+                                               json_object_object_add(val, "path", json_object_new_string(hdat->path));
+                                       }
+                               }
+                               json_object_object_add(obj, hdat->key, val);
+                       }
+               }
+       }
+       return obj;
+}
+
+static const char *req_raw(struct afb_hreq *hreq, size_t *size)
+{
+       const char *result = json_object_get_string(req_json(hreq));
+       *size = result ? strlen(result) : 0;
+       return result;
+}
+
+static void req_send(struct afb_hreq *hreq, const char *buffer, size_t size)
+{
+       afb_hreq_reply_copy(hreq, MHD_HTTP_OK, size, buffer, NULL);
+}
+
+static ssize_t send_json_cb(json_object *obj, uint64_t pos, char *buf, size_t max)
+{
+       ssize_t len = stpncpy(buf, json_object_to_json_string_ext(obj, JSON_C_TO_STRING_PLAIN)+pos, max) - buf;
+       return len ? : (ssize_t)MHD_CONTENT_READER_END_OF_STREAM;
+}
+
+static void req_reply(struct afb_hreq *hreq, unsigned retcode, const char *status, const char *info, json_object *resp)
+{
+       struct json_object *reply, *request;
+       const char *token, *uuid, *reqid;
+       struct MHD_Response *response;
+
+       token = afb_context_sent_token(&hreq->context);
+       uuid = afb_context_sent_uuid(&hreq->context);
+
+       reply = afb_msg_json_reply(status, info, resp, token, uuid);
+
+       reqid = afb_hreq_get_argument(hreq, long_key_for_reqid);
+       if (reqid == NULL)
+               reqid = afb_hreq_get_argument(hreq, short_key_for_reqid);
+       if (reqid != NULL && json_object_object_get_ex(reply, "request", &request))
+               json_object_object_add (request, short_key_for_reqid, json_object_new_string(reqid));
+
+       response = MHD_create_response_from_callback((uint64_t)strlen(json_object_to_json_string_ext(reply, JSON_C_TO_STRING_PLAIN)), SIZE_RESPONSE_BUFFER, (void*)send_json_cb, reply, (void*)json_object_put);
+       afb_hreq_reply(hreq, retcode, response, NULL);
+}
+
+static void req_fail(struct afb_hreq *hreq, const char *status, const char *info)
+{
+       req_reply(hreq, MHD_HTTP_OK, status, info, NULL);
+}
+
+static void req_success(struct afb_hreq *hreq, json_object *obj, const char *info)
+{
+       req_reply(hreq, MHD_HTTP_OK, "success", info, obj);
+}
+
+int afb_hreq_init_context(struct afb_hreq *hreq)
+{
+       const char *uuid;
+       const char *token;
+
+       if (hreq->context.session != NULL)
+               return 0;
+
+       uuid = afb_hreq_get_header(hreq, long_key_for_uuid);
+       if (uuid == NULL)
+               uuid = afb_hreq_get_argument(hreq, long_key_for_uuid);
+       if (uuid == NULL)
+               uuid = afb_hreq_get_cookie(hreq, cookie_name);
+       if (uuid == NULL)
+               uuid = afb_hreq_get_argument(hreq, short_key_for_uuid);
+
+       token = afb_hreq_get_header(hreq, long_key_for_token);
+       if (token == NULL)
+               token = afb_hreq_get_argument(hreq, long_key_for_token);
+       if (token == NULL)
+               token = afb_hreq_get_argument(hreq, short_key_for_token);
+
+       return afb_context_connect(&hreq->context, uuid, token);
+}
+
+int afb_hreq_init_cookie(int port, const char *path, int maxage)
+{
+       int rc;
+
+       free(cookie_name);
+       free(cookie_setter);
+       cookie_name = NULL;
+       cookie_setter = NULL;
+
+       path = path ? : "/";
+       rc = asprintf(&cookie_name, "%s-%d", long_key_for_uuid, port);
+       if (rc < 0)
+               return 0;
+       rc = asprintf(&cookie_setter, "%s=%%s; Path=%s; Max-Age=%d; HttpOnly",
+                       cookie_name, path, maxage);
+       if (rc < 0)
+               return 0;
+       return 1;
 }
 
-struct afb_req_itf afb_hreq_itf = {
-       .get_cookie = (void*)afb_hreq_get_cookie,
-       .get_argument = (void*)afb_hreq_get_argument
-};