dial spec 1.7

server/url_lib.c

@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2014 Netflix, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NETFLIX, INC. AND CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NETFLIX OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "url_lib.h"
+#include "dial_data.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+
+char* smartstrcat(char* dest, char* src, size_t max_chars) {
+    size_t copied = 0;
+    while ((*(dest++) = *(src++)) && copied++ < max_chars) {
+    }
+    // In case we over-stepped the size, end the string nicely.
+    *(--dest) = '\0';
+    return dest;
+}
+
+static int append_char_from_hex(char* dest, char a, char b) {
+    if ('a' <= a && a <= 'f')
+        a = 10 + a - 'a';
+    else if ('A' <= a && a <= 'F')
+        a = 10 + a - 'A';
+    else if ('0' <= a && a <= '9')
+        a = a - '0';
+    else
+        return 0;
+
+    if ('a' <= b && b <= 'f')
+        b = 10 + b - 'a';
+    else if ('A' <= b && b <= 'F')
+        b = 10 + b - 'A';
+    else if ('0' <= b && b <= '9')
+        b = b - '0';
+    else
+        return 0;
+
+    *dest = (char) (16 * a) + b;
+    return 1;
+}
+
+int urldecode(char *dst, const char *src, size_t max_size) {
+    size_t len = 0;
+
+    while (len < max_size && *src) {
+        if (*src == '+') {
+            *dst = ' ';
+        } else if (*src == '%') {
+            if (!*(++src) || !*(++src) || !append_char_from_hex(dst, *(src - 1), *src)) {
+                *dst = '\0';
+                return 0;
+            }
+        } else {
+            *dst = *src;
+        }
+        ++dst;
+        ++src;
+        ++len;
+    }
+    *dst = '\0';
+    return len;
+}
+
+void xmlencode(char *dst, const char *src, size_t max_size) {
+    size_t current_size = 0;
+    while (*src && current_size < max_size) {
+        switch (*src) {
+            case '&':
+                dst = smartstrcat(dst, "&amp;", max_size - current_size);
+                current_size += 5;
+                break;
+            case '\"':
+                dst = smartstrcat(dst, "&quot;", max_size - current_size);
+                current_size += 6;
+                break;
+            case '\'':
+                dst = smartstrcat(dst, "&apos;", max_size - current_size);
+                current_size += 6;
+                break;
+            case '<':
+                dst = smartstrcat(dst, "&lt;", max_size - current_size);
+                current_size += 4;
+                break;
+            case '>':
+                dst = smartstrcat(dst, "&gt;", max_size - current_size);
+                current_size += 4;
+                break;
+            default:
+                *dst++ = *src;
+                current_size++;
+                break;
+        }
+        src++;
+    }
+    *dst = '\0';
+}
+
+char *parse_app_name(const char *uri) {
+    if (uri == NULL) {
+        return "unknown";
+    }
+    char *slash = strrchr(uri, '/');
+    if (slash == NULL || slash == uri) {
+        return "unknown";
+    }
+    char *begin = slash;
+    while ((begin != uri) && (*--begin != '/'))
+        ;
+    begin++;  // skip the slash
+    char *result = (char *) calloc(1, slash - begin+1);
+    strncpy(result, begin, slash - begin);
+    result[slash-begin]='\0';
+    return result;
+}
+
+char *parse_param(char *query_string, char *param_name) {
+    if (query_string == NULL) {
+        return NULL;
+    }
+    char * start;
+    if ((start = strstr(query_string, param_name)) == NULL) {
+        return NULL;
+    }
+    while (*start && (*start++ != '='))
+        ;
+    char *end = start;
+    while (*end && (*end != '&'))
+        end++;
+    int result_size = end - start;
+    char *result = malloc(result_size + 1);
+    result[0] = '\0';
+    strncpy(result, start, result_size);
+    result[result_size] = '\0';
+    return result;
+}
+
+DIALData *parse_params(char * query_string) {
+    if (query_string == NULL || strlen(query_string) <= 2) {
+        return NULL;
+    }
+    if (query_string[0] == '?') {
+        query_string++;  // skip leading question mark
+    }
+    DIALData *result = NULL;
+    char *query_string_dup = strdup(query_string);
+    char * name_value = strtok(query_string_dup, "&");
+    while (name_value != NULL) {
+        DIALData *tmp = (DIALData *) malloc(sizeof(DIALData));
+        size_t name_value_length = strlen(name_value);
+        tmp->key = (char *) malloc(name_value_length);
+        tmp->value = (char *) malloc(name_value_length);
+        sscanf(name_value, "%[^=]=%s", tmp->key, tmp->value);
+        tmp->next = result;
+        result = tmp;
+
+        name_value = strtok(NULL, "&");  // read next token
+    }
+    free(query_string_dup);
+    return result;
+}