minimal-http-server-form-get
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|Example|Demonstrates|
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---|---
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minimal-http-server-dynamic|Serves both static and dynamically generated http content
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minimal-http-server-form-get|Process a GET form
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minimal-http-server-form-post|Process a POST form (no file transfer)
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minimal-http-server-libuv|Same as minimal-http-server but libuv event loop
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minimal-http-server-multivhost|Same as minimal-http-server but three different vhosts
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cmake_minimum_required(VERSION 2.8)
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include(CheckCSourceCompiles)
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set(SAMP lws-minimal-http-server-form-get)
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set(SRCS minimal-http-server-form-get.c)
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# If we are being built as part of lws, confirm current build config supports
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# reqconfig, else skip building ourselves.
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#
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# If we are being built externally, confirm installed lws was configured to
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# support reqconfig, else error out with a helpful message about the problem.
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#
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MACRO(require_lws_config reqconfig _val result)
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if (DEFINED ${reqconfig})
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if (${reqconfig})
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set (rq 1)
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else()
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set (rq 0)
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endif()
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else()
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set(rq 0)
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endif()
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if (${_val} EQUAL ${rq})
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set(SAME 1)
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else()
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set(SAME 0)
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endif()
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if (LWS_WITH_MINIMAL_EXAMPLES AND NOT ${SAME})
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if (${_val})
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message("${SAMP}: skipping as lws being built without ${reqconfig}")
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else()
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message("${SAMP}: skipping as lws built with ${reqconfig}")
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endif()
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set(${result} 0)
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else()
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if (LWS_WITH_MINIMAL_EXAMPLES)
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set(MET ${SAME})
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else()
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CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(${reqconfig})\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" HAS_${reqconfig})
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if (NOT DEFINED HAS_${reqconfig} OR NOT HAS_${reqconfig})
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set(HAS_${reqconfig} 0)
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else()
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set(HAS_${reqconfig} 1)
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endif()
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if ((HAS_${reqconfig} AND ${_val}) OR (NOT HAS_${reqconfig} AND NOT ${_val}))
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set(MET 1)
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else()
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set(MET 0)
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endif()
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endif()
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if (NOT MET)
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if (${_val})
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message(FATAL_ERROR "This project requires lws must have been configured with ${reqconfig}")
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else()
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message(FATAL_ERROR "Lws configuration of ${reqconfig} is incompatible with this project")
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endif()
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endif()
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endif()
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ENDMACRO()
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set(requirements 1)
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require_lws_config(LWS_WITHOUT_SERVER 0 requirements)
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if (requirements)
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add_executable(${SAMP} ${SRCS})
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if (websockets_shared)
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target_link_libraries(${SAMP} websockets_shared)
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add_dependencies(${SAMP} websockets_shared)
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else()
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target_link_libraries(${SAMP} websockets)
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endif()
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endif()
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# lws minimal http server form GET
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## build
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```
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$ cmake . && make
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```
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## usage
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```
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$ ./lws-minimal-http-server-form-get
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[2018/03/29 08:29:41:7044] USER: LWS minimal http server form GET | visit http://localhost:7681
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[2018/03/29 08:29:41:7044] NOTICE: Creating Vhost 'default' port 7681, 1 protocols, IPv6 off
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[2018/03/29 08:29:49:8601] USER: text1: (len 4) 'xxxx'
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[2018/03/29 08:29:49:8601] USER: send: (len 6) 'Submit'
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```
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Visit http://localhost:7681, submit the form.
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The form parameters are dumped to the log and you are redirected to a different page.
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/*
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* lws-minimal-http-server-form-get
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*
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* Copyright (C) 2018 Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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* This demonstrates a minimal http server that performs a form GET with a couple
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* of parameters. It dumps the parameters to the console log and redirects
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* to another page.
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*/
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#include <libwebsockets.h>
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#include <string.h>
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#include <signal.h>
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static int interrupted;
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static const char * param_names[] = {
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"text1",
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"send"
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};
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static int
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callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
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void *in, size_t len)
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{
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uint8_t buf[LWS_PRE + 256], *start = &buf[LWS_PRE], *p = start,
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*end = &buf[sizeof(buf) - 1];
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const char *val;
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int n;
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switch (reason) {
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case LWS_CALLBACK_HTTP:
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if (!lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI))
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/* not a GET */
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break;
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if (strcmp((const char *)in, "/form1"))
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/* not our form URL */
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break;
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/* we just dump the decoded things to the log */
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for (n = 0; n < (int)ARRAY_SIZE(param_names); n++) {
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val = lws_get_urlarg_by_name(wsi, param_names[n],
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(char *)buf, sizeof(buf));
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if (!val)
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lwsl_user("%s: undefined\n", param_names[n]);
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else
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lwsl_user("%s: (len %d) '%s'\n", param_names[n],
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(int)strlen((const char *)buf),buf);
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}
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/*
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* Our response is to redirect to a static page. We could
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* have generated a dynamic html page here instead.
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*/
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if (lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
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(unsigned char *)"after-form1.html",
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16, &p, end))
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return -1;
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/* we could add more headers here */
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if (lws_finalize_http_header(wsi, &p, end))
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return -1;
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n = lws_write(wsi, start, lws_ptr_diff(p, start),
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LWS_WRITE_HTTP_HEADERS |
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LWS_WRITE_H2_STREAM_END);
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if (n < 0)
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return -1;
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break;
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default:
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break;
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}
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return lws_callback_http_dummy(wsi, reason, user, in, len);
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}
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static struct lws_protocols protocols[] = {
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{ "http", callback_http, 0, 0 },
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{ NULL, NULL, 0, 0 } /* terminator */
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};
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/* default mount serves the URL space from ./mount-origin */
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static const struct lws_http_mount mount = {
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/* .mount_next */ NULL, /* linked-list "next" */
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/* .mountpoint */ "/", /* mountpoint URL */
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/* .origin */ "./mount-origin", /* serve from dir */
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/* .def */ "index.html", /* default filename */
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/* .protocol */ NULL,
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/* .cgienv */ NULL,
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/* .extra_mimetypes */ NULL,
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/* .interpret */ NULL,
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/* .cgi_timeout */ 0,
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/* .cache_max_age */ 0,
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/* .auth_mask */ 0,
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/* .cache_reusable */ 0,
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/* .cache_revalidate */ 0,
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/* .cache_intermediaries */ 0,
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/* .origin_protocol */ LWSMPRO_FILE, /* files in a dir */
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/* .mountpoint_len */ 1, /* char count */
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/* .basic_auth_login_file */ NULL,
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};
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void sigint_handler(int sig)
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{
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interrupted = 1;
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}
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int main(int argc, char **argv)
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{
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struct lws_context_creation_info info;
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struct lws_context *context;
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int n = 0;
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signal(SIGINT, sigint_handler);
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memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
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info.port = 7681;
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info.protocols = protocols;
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info.mounts = &mount;
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lws_set_log_level(LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
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/* for LLL_ verbosity above NOTICE to be built into lws,
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* lws must have been configured and built with
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* -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
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/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
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/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
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/* | LLL_DEBUG */, NULL);
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lwsl_user("LWS minimal http server GET | visit http://localhost:7681\n");
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context = lws_create_context(&info);
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if (!context) {
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lwsl_err("lws init failed\n");
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return 1;
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}
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while (n >= 0 && !interrupted)
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n = lws_service(context, 1000);
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lws_context_destroy(context);
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return 0;
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}
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<meta charset="UTF-8">
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<html>
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<body>
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<img src="libwebsockets.org-logo.png"><br>
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<h1>404</h1>
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Sorry, that file doesn't exist.
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</body>
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</html>
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<meta charset="UTF-8">
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<html>
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<body>
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<img src="libwebsockets.org-logo.png"><br>
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Thanks for posting the form.
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</body>
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</html>
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<meta charset="UTF-8">
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<html>
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<body>
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<img src="libwebsockets.org-logo.png"><br>
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Hello from the <b>minimal http form GET example</b>.
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<p>
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This is a static page served from ./mount-origin/index.html.
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<p>
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When you submit the form below, you will see the values of the<br>
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form parameters reported on the console log.
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<p>
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<form action="/form1" method="get">
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Type some text:<br>
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<input type="text" name="text1"><br>
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<input type="submit" name="send" value="Submit">
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</form>
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</body>
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</html>
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