liquid_feedback_frontend
view fastpath/getpic.c @ 782:e370594368e8
Optical enhancements
| author | bsw |
|---|---|
| date | Fri Jun 29 00:10:17 2012 +0200 (2012-06-29) |
| parents | 88ac7798b562 |
| children | 0f29051a49f6 |
line source
1 #include <stdlib.h>
2 #include <stdio.h>
3 #include <libpq-fe.h>
4 #include <string.h>
5 #include <regex.h>
6 #include <sys/types.h>
7 #include <sys/stat.h>
8 #include <unistd.h>
10 #ifndef GETPIC_CONNINFO
11 #define GETPIC_CONNINFO "dbname=liquid_feedback"
12 #endif
14 #ifndef GETPIC_DEFAULT_AVATAR
15 #define GETPIC_DEFAULT_AVATAR "/opt/liquid_feedback_testing/app/static/avatar.jpg"
16 #endif
18 int main(int argc, const char * const *argv) {
20 char *args_string;
21 char *member_id;
22 char *image_type;
23 const char *sql_member_image_params[2];
25 char *cookies;
26 regex_t session_ident_regex;
27 ssize_t start, length;
28 regmatch_t session_ident_regmatch[3];
29 char *session_ident;
30 const char *sql_session_params[1];
32 PGconn *conn;
33 PGresult *dbr;
35 args_string = getenv("QUERY_STRING");
36 cookies = getenv("HTTP_COOKIE");
37 if (!args_string || !cookies) {
38 fputs("Status: 403 Access Denied\n\n", stdout);
39 return 0;
40 }
42 member_id = strtok(args_string, "+");
43 image_type = strtok(NULL, "+");
44 sql_member_image_params[0] = member_id;
45 sql_member_image_params[1] = image_type;
47 if (regcomp(&session_ident_regex, "(^|[; \t])liquid_feedback_session=([0-9A-Za-z]+)", REG_EXTENDED) != 0) {
48 // shouldn't happen
49 abort();
50 }
51 if (regexec(&session_ident_regex, cookies, 3, session_ident_regmatch, 0) != 0) {
52 fputs("Status: 403 Access Denied\n\n", stdout);
53 return 0;
54 }
55 start = session_ident_regmatch[2].rm_so;
56 length = session_ident_regmatch[2].rm_eo - session_ident_regmatch[2].rm_so;
57 session_ident = malloc(length + 1);
58 if (!session_ident) abort(); // shouldn't happen
59 strncpy(session_ident, cookies + start, length);
60 session_ident[length] = 0;
61 sql_session_params[0] = session_ident;
63 conn = PQconnectdb(GETPIC_CONNINFO);
64 if (!conn) {
65 fputs("Could not create PGconn structure.\n", stderr);
66 return 1;
67 }
68 if (PQstatus(conn) != CONNECTION_OK) {
69 fputs(PQerrorMessage(conn), stderr);
70 PQfinish(conn);
71 return 1;
72 }
74 dbr = PQexecParams(conn,
75 "SELECT NULL FROM session JOIN member ON member.id = session.member_id WHERE session.ident = $1 AND member.active",
76 1, NULL, sql_session_params, NULL, NULL, 0
77 );
78 if (PQresultStatus(dbr) != PGRES_TUPLES_OK) {
79 fputs(PQresultErrorMessage(dbr), stderr);
80 PQfinish(conn);
81 return 1;
82 }
83 if (PQntuples(dbr) != 1) {
84 fputs("Status: 403 Access Denied\n\n", stdout);
85 PQfinish(conn);
86 return 0;
87 }
89 dbr = PQexecParams(conn,
90 "SELECT content_type, data "
91 "FROM member_image "
92 "WHERE member_id = $1 "
93 "AND image_type = $2 "
94 "AND scaled "
95 "LIMIT 1;",
96 2, NULL, sql_member_image_params, NULL, NULL, 1
97 );
98 if (PQresultStatus(dbr) != PGRES_TUPLES_OK) {
99 fputs(PQresultErrorMessage(dbr), stderr);
100 PQfinish(conn);
101 return 1;
102 }
103 if (PQntuples(dbr) == 0) {
104 struct stat sb;
105 PQclear(dbr);
106 PQfinish(conn);
107 fputs("Content-Type: image/jpeg\n\n", stdout);
108 if (stat(GETPIC_DEFAULT_AVATAR, &sb)) return 1;
109 fprintf(stdout, "Content-Length: %i\n", (int)sb.st_size);
110 execl("/bin/cat", "cat", GETPIC_DEFAULT_AVATAR, NULL);
111 return 1;
112 } else {
113 if (PQnfields(dbr) < 0) {
114 fputs("Too few columns returned by database.\n", stderr);
115 PQfinish(conn);
116 return 1;
117 }
118 if (PQfformat(dbr, 0) != 1 || PQfformat(dbr, 1) != 1) {
119 fputs("Database did not return data in binary format.\n", stderr);
120 PQfinish(conn);
121 return 1;
122 }
123 if (PQgetisnull(dbr, 0, 0) || PQgetisnull(dbr, 0, 1)) {
124 fputs("Unexpected NULL in database result.\n", stderr);
125 PQfinish(conn);
126 return 1;
127 }
128 fprintf(stdout, "Content-Type: %s\n\n", PQgetvalue(dbr, 0, 0));
129 fwrite(PQgetvalue(dbr, 0, 1), PQgetlength(dbr, 0, 1), 1, stdout);
130 }
131 PQfinish(conn);
132 return 0;
134 }