From 0a7300402e70c6da6bdb51e039e5371e99e0cfd1 Mon Sep 17 00:00:00 2001
From: Nick Krichevsky <nick@ollien.com>
Date: Sun, 9 Sep 2018 19:46:31 -0400
Subject: [PATCH] Send files on request

---
 server/socket_server.c | 63 ++++++++++++++++++++++++++++++++++++++----
 server/socket_server.h |  1 +
 2 files changed, 59 insertions(+), 5 deletions(-)

diff --git a/server/socket_server.c b/server/socket_server.c
index 26f0e56..d3e33ff 100644
--- a/server/socket_server.c
+++ b/server/socket_server.c
@@ -84,7 +84,7 @@ struct server_info setup(int port) {
  *
  * @return -1 on error, 0 otherwise.
  */
-static int send_headers(int status_code, int client_socket, int content_length) {
+static int send_headers(int status_code, int client_socket, long content_length) {
     const char *status_code_message = get_message_from_status_code(status_code);
     if (status_code_message == NULL) {
         return -1;
@@ -107,7 +107,7 @@ static int send_headers(int status_code, int client_socket, int content_length)
         // Get the number of chars in the port
         int content_length_length = floor(log10(content_length)) + 1;
         char *content_length_string = malloc((content_length_length + 1) * sizeof(char));
-        sprintf(content_length_string, "%d", content_length);
+        sprintf(content_length_string, "%ld", content_length);
         const char *content_length_header_components[] = {HEADER_CONTENT_LENGTH, ": ", content_length_string, "\r\n"};
         int content_length_header_length = get_buffer_size(content_length_header_components, 4);
         header_buffer_size += content_length_header_length;
@@ -140,6 +140,29 @@ static int send_headers(int status_code, int client_socket, int content_length)
     return 0;
 }
 
+/**
+ * Send a file over the socket.
+ *
+ * @param client_fd The file descriptor to send on.
+ * @param file The file to read
+ *
+ * @return -1 on error, 0 on success.
+ */
+static int send_file(int client_fd, struct requested_file file) {
+    char *buffer = malloc(FILE_BUFFER_SIZE * sizeof(char));
+    while (fgets(buffer, FILE_BUFFER_SIZE, file.file) != NULL) {
+        int bytes_read = strlen(buffer);
+        int send_result = send(client_fd, buffer, bytes_read, 0);
+        if (send_result == -1) {
+            free(buffer);
+            return -1;
+        }
+    }
+    free(buffer);
+
+    return 0;
+}
+
 enum socket_result serve_one_request(int sock_fd) {
     int client_fd = accept(sock_fd, NULL, NULL);
     if (client_fd == -1) {
@@ -147,9 +170,39 @@ enum socket_result serve_one_request(int sock_fd) {
     }
     struct http_message message = {};
     get_all_remote_parts(client_fd, TYPE_SERVER, &message);
-    printf("%s\n", message.contents);
-    char *msg = "HTTP/1.1 501 Not Imlemented Yet ;p\r\n\r\n";
-    send(client_fd, msg, strlen(msg), 0);
+    struct request_line parsed_request_line;
+    int parse_result = parse_request_line(message.start_line, &parsed_request_line);
+    if (parse_result == -1) {
+        send_headers(400, client_fd, -1);
+        shutdown(client_fd, SHUT_RDWR);
+        close(client_fd);
+        return RESULT_PROCESSING_ERROR;
+    }
+    struct requested_file file;
+    int file_result = get_file_from_url(parsed_request_line.uri, &file);
+    if (file_result == -1) {
+        int send_result = 0;
+        if (errno == ENOENT) {
+            send_result = send_headers(404, client_fd, -1);
+        } else if (errno == EACCES) {
+            send_result = send_headers(403, client_fd, -1);
+        } else {
+            send_headers(500, client_fd, -1);
+            shutdown(client_fd, SHUT_RDWR);
+            close(client_fd);
+            return RESULT_PROCESSING_ERROR;
+        }
+
+        if (send_result != 0) {
+            shutdown(client_fd, SHUT_RDWR);
+            close(client_fd);
+            return RESULT_WRITE_ERROR;
+        }
+    } else {
+        send_headers(200, client_fd, file.size);
+        send_file(client_fd, file);
+    }
+
     shutdown(client_fd, SHUT_RDWR);
     close(client_fd);
     return RESULT_OK;
diff --git a/server/socket_server.h b/server/socket_server.h
index b88a2d9..1ef050c 100644
--- a/server/socket_server.h
+++ b/server/socket_server.h
@@ -5,6 +5,7 @@
 
 #define BACKLOG_SIZE 8;
 #define HTTP_VERSION "HTTP/1.1"
+#define FILE_BUFFER_SIZE 1024
 
 enum server_status {STATUS_LISTENING, STATUS_CLOSED, STATUS_ERROR};
 struct server_info {