Cleanup handling of environment variables

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

3 files changed, 45 insertions, 33 deletions

diff --git a/cgit.c b/cgit.c
index 7b228af..a92383d 100644
--- a/cgit.c
+++ b/cgit.c
@@ -215,6 +215,11 @@ static void querystring_cb(const char *name, const char *value)
         }
 }
 
+char *xstrdupn(const char *str)
+{
+        return (str ? xstrdup(str) : NULL);
+}
+
 static void prepare_context(struct cgit_context *ctx)
 {
         memset(ctx, 0, sizeof(ctx));
@@ -245,6 +250,15 @@ static void prepare_context(struct cgit_context *ctx)
         ctx->cfg.summary_branches = 10;
         ctx->cfg.summary_log = 10;
         ctx->cfg.summary_tags = 10;
+        ctx->env.cgit_config = xstrdupn(getenv("CGIT_CONFIG"));
+        ctx->env.http_host = xstrdupn(getenv("HTTP_HOST"));
+        ctx->env.https = xstrdupn(getenv("HTTPS"));
+        ctx->env.path_info = xstrdupn(getenv("PATH_INFO"));
+        ctx->env.query_string = xstrdupn(getenv("QUERY_STRING"));
+        ctx->env.request_method = xstrdupn(getenv("REQUEST_METHOD"));
+        ctx->env.script_name = xstrdupn(getenv("SCRIPT_NAME"));
+        ctx->env.server_name = xstrdupn(getenv("SERVER_NAME"));
+        ctx->env.server_port = xstrdupn(getenv("SERVER_PORT"));
         ctx->page.mimetype = "text/html";
         ctx->page.charset = PAGE_ENCODING;
         ctx->page.filename = NULL;
@@ -253,6 +267,12 @@ static void prepare_context(struct cgit_context *ctx)
         ctx->page.expires = ctx->page.modified;
         ctx->page.etag = NULL;
         memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
+        if (ctx->env.script_name)
+                ctx->cfg.script_name = ctx->env.script_name;
+        if (ctx->env.query_string)
+                ctx->qry.raw = ctx->env.query_string;
+        if (!ctx->env.cgit_config)
+                ctx->env.cgit_config = CGIT_CONFIG;
 }
 
 struct refmatch {
@@ -477,8 +497,6 @@ static int calc_ttl()
 
 int main(int argc, const char **argv)
 {
-        const char *cgit_config_env = getenv("CGIT_CONFIG");
-        const char *method = getenv("REQUEST_METHOD");
         const char *path;
         char *qry;
         int err, ttl;
@@ -488,13 +506,8 @@ int main(int argc, const char **argv)
         cgit_repolist.count = 0;
         cgit_repolist.repos = NULL;
 
-        if (getenv("SCRIPT_NAME"))
-                ctx.cfg.script_name = xstrdup(getenv("SCRIPT_NAME"));
-        if (getenv("QUERY_STRING"))
-                ctx.qry.raw = xstrdup(getenv("QUERY_STRING"));
         cgit_parse_args(argc, argv);
-        parse_configfile(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
-                         config_cb);
+        parse_configfile(ctx.env.cgit_config, config_cb);
         ctx.repo = NULL;
         http_parse_querystring(ctx.qry.raw, querystring_cb);
 
@@ -509,7 +522,7 @@ int main(int argc, const char **argv)
          * urls without the need for rewriterules in the webserver (as
          * long as PATH_INFO is included in the cache lookup key).
          */
-        path = getenv("PATH_INFO");
+        path = ctx.env.path_info;
         if (!ctx.qry.url && path) {
                 if (path[0] == '/')
                         path++;
@@ -525,7 +538,7 @@ int main(int argc, const char **argv)
 
         ttl = calc_ttl();
         ctx.page.expires += ttl*60;
-        if (method && !strcmp(method, "HEAD"))
+        if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
                 ctx.cfg.nocache = 1;
         if (ctx.cfg.nocache)
                 ctx.cfg.cache_size = 0;
diff --git a/cgit.h b/cgit.h
index 4c854ea..893231d 100644
--- a/cgit.h
+++ b/cgit.h
@@ -207,7 +207,20 @@ struct cgit_page {
         char *statusmsg;
 };
 
+struct cgit_environment {
+        char *cgit_config;
+        char *http_host;
+        char *https;
+        char *path_info;
+        char *query_string;
+        char *request_method;
+        char *script_name;
+        char *server_name;
+        char *server_port;
+};
+
 struct cgit_context {
+        struct cgit_environment env;
         struct cgit_query qry;
         struct cgit_config cfg;
         struct cgit_repo *repo;
diff --git a/ui-shared.c b/ui-shared.c
index 015c52b..538ddda 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -36,10 +36,7 @@ void cgit_print_error(char *msg)
 
 char *cgit_httpscheme()
 {
-        char *https;
-
-        https = getenv("HTTPS");
-        if (https != NULL && strcmp(https, "on") == 0)
+        if (ctx.env.https && !strcmp(ctx.env.https, "on"))
                 return "https://";
         else
                 return "http://";
@@ -47,22 +44,13 @@ char *cgit_httpscheme()
 
 char *cgit_hosturl()
 {
-        char *host, *port;
-
-        host = getenv("HTTP_HOST");
-        if (host) {
-                host = xstrdup(host);
-        } else {
-                host = getenv("SERVER_NAME");
-                if (!host)
-                        return NULL;
-                port = getenv("SERVER_PORT");
-                if (port && atoi(port) != 80)
-                        host = xstrdup(fmt("%s:%d", host, atoi(port)));
-                else
-                        host = xstrdup(host);
-        }
-        return host;
+        if (ctx.env.http_host)
+                return ctx.env.http_host;
+        if (!ctx.env.server_name)
+                return NULL;
+        if (!ctx.env.server_port || atoi(ctx.env.server_port) == 80)
+                return ctx.env.server_name;
+        return xstrdup(fmt("%s:%s", ctx.env.server_name, ctx.env.server_port));
 }
 
 char *cgit_rooturl()
@@ -467,8 +455,6 @@ void cgit_print_age(time_t t, time_t max_relative, char *format)
 
 void cgit_print_http_headers(struct cgit_context *ctx)
 {
-        const char *method = getenv("REQUEST_METHOD");
-
         if (ctx->cfg.embedded)
                 return;
 
@@ -489,7 +475,7 @@ void cgit_print_http_headers(struct cgit_context *ctx)
         if (ctx->page.etag)
                 htmlf("ETag: \"%s\"\n", ctx->page.etag);
         html("\n");
-        if (method && !strcmp(method, "HEAD"))
+        if (ctx->env.request_method && !strcmp(ctx->env.request_method, "HEAD"))
                 exit(0);
 }