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#include <stdbool.h>
#include <stdarg.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <microhttpd.h>
#define CONTAINER_IMPLEMENTATION
#define JACSON_IMPLEMENTATION
#define JACSON_EXPORT_RSNPRINTF
#include <jacson.h>
#define COMMON_IMPLEMENTATION
#include <common.h>
const char *const JSON_ERROR = "{\"error\":\"%s\"}";
const char *const HTML_ERROR = "<!DOCTYPE html><html><body>Error: %s</body></html>";
const char *const JSON_SERVER_ERROR = "{\"error\":\"%s\",\"what\":\"%s\"}";
const char *const HTML_SERVER_ERROR = "<!DOCTYPE html><html><body>Error: %s<br>Server error message: <p style=\"font-style: monospace\">%s</p></body></html>";
const char *const INSUFFICIENT_ARGUMENTS = "insufficient arguments";
const char *const INVALID_ARGUMENTS = "invalid arguments";
const char *const OCCUPIED = "occupied";
const char *const SERVER_ERRORMSG = "server error";
const char *const UNKNOWN = "unknown";
const char *const HTML_PROLOGUE = "<!DOCTYPE html><html><head><meta charset=\"utf-8\"></head><body>";
const char *const HTML_EPILOGUE = "</html></body>";
struct global_args {
enum {
GA_FMT_JSON = 0,
GA_FMT_HTML = 1
} format;
};
struct fmt_const {
const char *error, *server_error, *content_type;
};
static struct fmt_const fmts[] = {
[GA_FMT_JSON] = {JSON_ERROR, JSON_SERVER_ERROR, "application/json"},
[GA_FMT_HTML] = {HTML_ERROR, HTML_SERVER_ERROR, "text/html"}
};
// string builder
struct sb {
char* str;
size_t sz;
size_t ln;
};
size_t sbprintf(struct sb* s, const char* fmt, ...) {
va_list l;
va_start(l, fmt);
return s->ln += __jacson_vrsnprintf(&s->str, &s->sz, s->ln, fmt, l);
}
enum MHD_Result arg_builder (void *cls, enum MHD_ValueKind kind, const char *key, const char *value) {
struct sb *html = cls;
html->ln += __jacson_rsnprintf(&html->str, &html->sz, html->ln, "<li><p style=\"font-style:monospace;\">%s: %s</p></li>", key, value);
return MHD_YES;
}
struct global_args parse_global_args(struct MHD_Connection *connection) {
const char* key, *val;
struct global_args ret = { .format = GA_FMT_JSON };
key = "format";
if ( (val = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, key))
&& !strcmp(val, "html")) ret.format = GA_FMT_HTML;
return ret;
}
char *db_add_url(const char *url, const char *path) {
return "test";
}
bool db_del_url(const char *path) {
return false;
}
// dong: output parameter
char *db_get_info(const char *path, long *dong) {
*dong = 0;
return NULL;
}
char *db_get_url(const char *path) {
return NULL;
}
// alphabet: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
// returns 0 if no conversion is available
static inline char itoc(register unsigned long l) {
#ifdef __GNUC__
char add[256] = {
[0 ... 9] = '0',
[10 ... 35] = 'a' - 10,
[36 ... 61] = 'A' - 10 - 26,
};
return (l < 62) * (l + add[l]);
#else
if (l < 10) return '0' + l;
if (l < 10 + 26) return 'a' + l - 10;
if (l < 10 + 2 * 26) return 'A' + l - 10 - 26;
return '\0';
#endif
}
// returns negative number if conversion not available
static inline unsigned long ctoi(register char c) {
#ifdef __GNUC__
char sub[127] = {
[0 ... '0'-1] = 128,
['0' ... '9'] = '0',
['A' ... 'Z'] = 'A' - 26 - 10,
['a' ... 'z'] = 'a' - 10,
};
return c - sub[c];
#else
TODO;
#endif
}
// buf must be at least 12 characters (11 for strnig and 1 for termination byte)
// returns a pointer from which the string starts
static char *itou(register unsigned long i, register char *buf) {
register ssize_t ind = 11;
buf[ind] = '\0';
buf[ind - 1] = '0';
while (ind >= 0 && i) {
buf[--ind] = itoc(i % 62);
i /= 62;
}
return buf + ind;
}
static unsigned long utoi(const char *s) {
register unsigned long result = 0;
while (*s) {
result *= 62;
result += ctoi(*s);
++s;
}
return result;
}
// index, path: /
struct MHD_Response *ENDP_(struct MHD_Connection* connection, int *status) {
return get_from_file("www/index.html");
}
// path: /getargs
struct MHD_Response *ENDP_getargs(struct MHD_Connection *connection, int *status) {
struct sb html = {calloc(64, 1), 63, 0};
html.ln += __jacson_rsnprintf(&html.str, &html.sz, html.ln,
"<!DOCTYPE html><html><head><meta charset=\"utf-8\"></head><body><h3>List of arguments</h3><ol>");
MHD_get_connection_values(connection, MHD_GET_ARGUMENT_KIND, &arg_builder, &html);
html.ln += __jacson_rsnprintf(&html.str, &html.sz, html.ln, "</ol></body></html>");
const char *val = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "test");
if (val) fprintf(stderr, "test = %s\n", val);
fprintf(stderr, "test pointer = %p", val);
return MHD_create_response_from_buffer(html.ln, html.str, MHD_RESPMEM_MUST_FREE);
}
// API, path: /api/linkadd
struct MHD_Response *ENDP_api_linkadd(struct MHD_Connection *connection, int *status) {
const char *url = NULL, *path = NULL;
char *newurl;
struct sb resp = {malloc(64), 63, 0};
struct global_args glob = parse_global_args(connection);
struct MHD_Response *response;
if ((url = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "url")) == NULL || *url == '\0') {
*status = MHD_HTTP_BAD_REQUEST;
sbprintf(&resp, fmts[glob.format].error, INSUFFICIENT_ARGUMENTS);
goto exit;
}
path = MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND, "try");
if ((newurl = db_add_url(url, path)) == NULL) {
*status = MHD_HTTP_INTERNAL_SERVER_ERROR;
sbprintf(&resp, fmts[glob.format].server_error, SERVER_ERRORMSG, "database write failed");
goto exit;
}
if (glob.format == GA_FMT_JSON) sbprintf(&resp, "{\"url\":\"%s\"}", newurl);
else sbprintf(&resp, "%sYour URL: <a href\"%s\">/%s</a>%s", HTML_PROLOGUE, newurl, newurl, HTML_EPILOGUE);
exit:
response = MHD_create_response_from_buffer(resp.ln, resp.str, MHD_RESPMEM_MUST_FREE);
MHD_add_response_header(response, "Content-Type", fmts[glob.format].content_type);
return response;
}
// API, path: /api/linkdel
struct MHD_Response *ENDP_api_linkdel(struct MHD_Connection *connection, int *status) {
}
// API, path: /api/linkget
struct MHD_Response *ENDP_api_linkget(struct MHD_Connection *connection, int *status) { }
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