1 files changed, 184 insertions, 0 deletions

diff --git a/xs_httpd.h b/xs_httpd.h
new file mode 100644
index 0000000..3d520ec
--- /dev/null
+++ b/xs_httpd.h
@@ -0,0 +1,184 @@
+/* copyright (c) 2022 grunfink - MIT license */
+
+#ifndef _XS_HTTPD_H
+
+#define _XS_HTTPD_H
+
+d_char *xs_url_dec(char *str);
+d_char *xs_url_vars(char *str);
+d_char *xs_httpd_request(FILE *f);
+void xs_httpd_response(FILE *f, int status, d_char *headers, char *body, int b_size);
+
+
+#ifdef XS_IMPLEMENTATION
+
+d_char *xs_url_dec(char *str)
+/* decodes an URL */
+{
+    d_char *s = xs_str_new(NULL);
+
+    while (*str) {
+        if (*str == '%') {
+            int i;
+
+            if (sscanf(str + 1, "%02x", &i) == 1) {
+                unsigned char uc = i;
+
+                s = xs_append_m(s, (char *)&uc, 1);
+                str += 2;
+            }
+        }
+        else
+        if (*str == '+')
+            s = xs_append_m(s, " ", 1);
+        else
+            s = xs_append_m(s, str, 1);
+
+        str++;
+    }
+
+    return s;
+}
+
+
+d_char *xs_url_vars(char *str)
+/* parse url variables */
+{
+    d_char *vars;
+
+    vars = xs_dict_new();
+
+    if (str != NULL) {
+        char *v, *l;
+        xs *args;
+
+        /* split by arguments */
+        args = xs_split(str, "&");
+
+        l = args;
+        while (xs_list_iter(&l, &v)) {
+            xs *kv = xs_splitn(v, "=", 2);
+
+            if (xs_list_len(kv) == 2)
+                vars = xs_dict_append(vars,
+                    xs_list_get(kv, 0), xs_list_get(kv, 1));
+        }
+    }
+
+    return vars;
+}
+
+
+d_char *xs_httpd_request(FILE *f)
+/* processes an httpd connection */
+{
+    xs *headers = NULL;
+    xs *q_vars  = NULL;
+    xs *p_vars  = NULL;
+    d_char *req = NULL;
+    xs *l1, *l2;
+    char *v;
+
+    xs_socket_timeout(fileno(f), 2.0, 0.0);
+
+    /* read the first line and split it */
+    l1 = xs_strip(xs_readline(f));
+    l2 = xs_split(l1, " ");
+
+    if (xs_list_len(l2) != 3) {
+        /* error or timeout */
+        return NULL;
+    }
+
+    headers = xs_dict_new();
+
+    headers = xs_dict_append(headers, "method", xs_list_get(l2, 0));
+    headers = xs_dict_append(headers, "proto",  xs_list_get(l2, 2));
+
+    {
+        /* split the path with its optional variables */
+        xs *udp = xs_url_dec(xs_list_get(l2, 1));
+        xs *pnv = xs_splitn(udp, "?", 1);
+
+        /* store the path */
+        headers = xs_dict_append(headers, "path", xs_list_get(pnv, 0));
+
+        /* get the variables */
+        q_vars = xs_url_vars(xs_list_get(pnv, 1));
+    }
+
+    /* read the headers */
+    for (;;) {
+        xs *l, *p = NULL;
+
+        l = xs_strip(xs_readline(f));
+
+        /* done with the header? */
+        if (strcmp(l, "") == 0)
+            break;
+
+        /* split header and content */
+        p = xs_splitn(l, ": ", 1);
+
+        if (xs_list_len(p) == 2)
+            headers = xs_dict_append(headers,
+                xs_tolower(xs_list_get(p, 0)), xs_list_get(p, 1));
+    }
+
+    xs_socket_timeout(fileno(f), 5.0, 0.0);
+
+    /* does it have a payload with form urlencoded variables? */
+    v = xs_dict_get(headers, "content-type");
+
+    if (v && strcmp(v, "application/x-www-form-urlencoded") == 0) {
+        if ((v = xs_dict_get(headers, "content-length")) != NULL) {
+            int cl = atoi(v);
+            xs *payload;
+
+            if ((payload = xs_read(f, cl)) != NULL) {
+                xs *upl = xs_url_dec(payload);
+                p_vars = xs_url_vars(upl);
+            }
+        }
+    }
+    else
+        p_vars = xs_dict_new();
+
+    if (errno == 0) {
+        req = xs_dict_new();
+        req = xs_dict_append(req, "headers", headers);
+        req = xs_dict_append(req, "q_vars",  q_vars);
+        req = xs_dict_append(req, "p_vars",  p_vars);
+    }
+
+    return req;
+}
+
+
+void xs_httpd_response(FILE *f, int status, d_char *headers, char *body, int b_size)
+/* sends an httpd response */
+{
+    xs *proto;
+    char *p, *k, *v;
+
+    proto = xs_fmt("HTTP/1.1 %d", status);
+    fprintf(f, "%s\r\n", proto);
+
+    p = headers;
+    while (xs_dict_iter(&p, &k, &v)) {
+        fprintf(f, "%s: %s\r\n", k, v);
+    }
+
+    if (b_size != 0)
+        fprintf(f, "content-length: %d\r\n", b_size);
+
+    fprintf(f, "\r\n");
+
+    if (body != NULL && b_size != 0)
+        fwrite(body, b_size, 1, f);
+}
+
+
+#endif /* XS_IMPLEMENTATION */
+
+#endif /* XS_HTTPD_H */