Got the If-Modified-By working

http.c

@@ -3,9 +3,14 @@
 //
 
 #include <stdio.h>
+#include <stdlib.h>
+#define _XOPEN_SOURCE
+#include <time.h>
+#include <locale.h>
 #include "http.h"
 #include "utils.h"
-#include "string.h"
+#include <string.h>
+
 
 /// Gets the HTTP verb from the
 /// \param string
@@ -36,3 +41,29 @@ void get_http_path(char *request, char *path) {
 int parseHeader(char *header) {
 
 }
+
+int parseHeaders(char *request, struct tm *tm, int *hasDate) {
+    char *strtok_status, *line;
+    line = strtok_r(request, "\n", &strtok_status);
+    line = strtok_r(NULL, "\n", &strtok_status);
+    int c = 0;
+    do {
+        char key[100], value[100];
+        sscanf(line, "%99[^:]: %99[^\r]", key, value);
+        fprintf(stderr, "\nc:%d key: %s value: %s\n", c, key, value);
+        char *headerName = "If-Modified-Since";
+        if (strncmp(headerName, key, strlen(headerName)) == 0) {
+            time_t t;
+            if (strptime(value, "%a %b %d %H:%M:%S %Y", tm) == NULL) {
+                fprintf(stderr, "Invalid Date");
+            }
+            char buf[255];
+            strftime(buf, sizeof(buf), "%d %b %Y %H:%M", tm);
+            fprintf(stderr, "\nParsed date: %s\n", buf);
+            fprintf(stderr, "Has date");
+            *hasDate = 1;
+        }
+        c++;
+    } while ((line = strtok_r(NULL, "\n", &strtok_status)) != NULL);
+
+}
\ No newline at end of file

http.h

@@ -4,6 +4,8 @@
 
 #ifndef COMS352_PROJECT2_PART2_HTTP_H
 #define COMS352_PROJECT2_PART2_HTTP_H
+
+#include <time.h>
 // Struct of methods used on this project
 typedef enum {
     HTTP_GET,
@@ -13,4 +15,6 @@ typedef enum {
 
 HTTP_VERB get_http_verb(char *request);
 void get_http_path(char *request, char *path);
+int parseHeaders(char *request, struct tm *tm, int *hasDate);
 #endif //COMS352_PROJECT2_PART2_HTTP_H
+

main.c

@@ -39,6 +39,4 @@ int main() {
     }
 }
 
-#pragma clang diagnostic pop
-
+#pragma clang diagnostic pop
\ No newline at end of file
-

network.c

@@ -10,6 +10,8 @@
 #include <unistd.h>
 #include <netinet/in.h>
 #include <poll.h>
+#include <sys/stat.h>
+#include <time.h>
 
 #include "network.h"
 #include "buffer.h"
@@ -52,11 +54,28 @@ int handle_client(int clientfd) {
         char *path = malloc(sizeof(char) * 1024);
         get_http_path(request.array, path);
         fprintf(stdout, "Verb:%d Path:%s\n", verb, path);
+        int hasDate;
+        struct tm tm;
+        parseHeaders(request.array, &tm, &hasDate);
         // Setup for getting the response
         GrowthBuffer response;
         initBuffer(&response, 5000);
         // If the exsits return 200
         if (checkFile(path) != -1) {
+            if (hasDate == 1) {
+                fprintf(stderr, "DEUBG: started date secton");
+                struct stat statbuff;
+                stat(path, &statbuff);
+                time_t headerTime = mktime(&tm);
+                time_t fileTime = statbuff.st_ctime;
+                fprintf(stderr, "\nfileTime = %d", fileTime);
+                if (difftime(fileTime, headerTime) < 0.0) {
+                    char *basicHeader = "HTTP/1.1 304 Not Modified\r\n\r\n";
+                    write(clientfd, basicHeader, strlen(basicHeader));
+                    shutdown(clientfd, SHUT_RDWR);
+                    exit(EXIT_SUCCESS);
+                }
+            }
             char *basicHeader = "HTTP/1.1 200 OK\r\n\r\n";
             appendBuffer(&response, basicHeader, strlen(basicHeader));
             write(clientfd, response.array, strlen(response.array));

network.h

@@ -15,7 +15,7 @@ int bind_socket();
 
 void getRequest(int clientfd, GrowthBuffer *request);
 
-#define PORT 26885
+#define PORT 2681
 #define DEBUG 0
 #define TRUE 1
 #endif //COMS352_PROJECT2_PART2_NETWORK_H