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brought back 7.5 file-upload as file-upload-multiple-posts; updated to latest API

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renamed form-upload to file-upload-html-form
renamed file-upload to file-upload-single-post
This commit is contained in:
Sergio R. Caprile 2022-06-17 16:35:02 -03:00
parent 3331ed2f49
commit f4fc33d111
13 changed files with 121 additions and 0 deletions
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examples/file-upload/Makefile → examples/file-upload-html-form/Makefile
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examples/file-upload/README.md → examples/file-upload-html-form/README.md
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examples/form-upload/main.c → examples/file-upload-html-form/main.c
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examples/form-upload/web_root/index.html → examples/file-upload-html-form/web_root/index.html
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examples/form-upload/Makefile → examples/file-upload-multiple-posts/Makefile
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examples/form-upload/README.md → examples/file-upload-multiple-posts/README.md
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examples/file-upload-multiple-posts/main.c Normal file
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// Copyright (c) 2020 Cesanta Software Limited
// All rights reserved
#include "mongoose.h"
// HTTP request handler function. It implements the following endpoints:
// /upload - Saves the next file chunk
// all other URI - serves web_root/ directory
static void cb(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
if (ev == MG_EV_HTTP_MSG) {
struct mg_http_message *hm = (struct mg_http_message *) ev_data;
if (mg_http_match_uri(hm, "/upload")) {
mg_http_upload(c, hm, &mg_fs_posix, "/tmp");
} else {
struct mg_http_serve_opts opts = {.root_dir = "web_root"};
mg_http_serve_dir(c, ev_data, &opts);
}
}
}
int main(void) {
struct mg_mgr mgr;
struct mg_timer t1;
mg_mgr_init(&mgr);
mg_log_set("3");
mg_http_listen(&mgr, "http://localhost:8000", cb, NULL);
for (;;) mg_mgr_poll(&mgr, 50);
mg_mgr_free(&mgr);
return 0;
}

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examples/file-upload-multiple-posts/web_root/app.js Normal file
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// Copyright (c) 2020 Cesanta Software Limited
// All rights reserved
// Helper function to display upload status
var setStatus = function(text) {
document.getElementById('el3').innerText = text;
};
// When user clicks on a button, trigger file selection dialog
var button = document.getElementById('el2');
button.onclick = function(ev) {
input.click();
};
// Send a large blob of data chunk by chunk
var sendFileData = function(name, data, chunkSize) {
var sendChunk = function(offset) {
var chunk = data.subarray(offset, offset + chunkSize) || '';
var opts = {method: 'POST', body: chunk};
var url = '/upload?offset=' + offset + '&name=' + encodeURIComponent(name);
setStatus(
'sending bytes ' + offset + '..' + (offset + chunk.length) + ' of ' +
data.length);
fetch(url, opts).then(function(res) {
if (chunk.length > 0) sendChunk(offset + chunk.length);
});
};
sendChunk(0);
};
// If user selected a file, read it into memory and trigger sendFileData()
var input = document.getElementById('el1');
input.onchange = function(ev) {
if (!ev.target.files[0]) return;
var f = ev.target.files[0], r = new FileReader();
r.readAsArrayBuffer(f);
r.onload = function() {
ev.target.value = '';
sendFileData(f.name, new Uint8Array(r.result), 4096);
};
};

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examples/file-upload-multiple-posts/web_root/index.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<title>example</title>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style>
#container { margin-right: auto; margin-left: auto; max-width: 480px; }
#info { background: #e0f0f0; border-radius: .5em; padding: 2em; }
#wrapper { margin-top: 1em; }
</style>
</head>
<body>
<div id="container">
<div id="info">
Mongoose always buffers a full HTTP message before invoking
the MG_EV_HTTP_MSG event. A big POST request would require a lot
of RAM to buffer everything. Therefore, in order to upload large
files on memory-constrained systems, a large file should be sent
in small chunks.
<br/><br/>
In this example, the JavaScript code on this page sends the chosen
file in 4K chunks using the <code>/upload</code> endpoint.
The uploaded file is stored in the <code>/tmp</code> directory by
the helper API function <code>mg_http_upload()</code>
</div>
<div id="wrapper">
<input type="file" id="el1" style="display: none"/>
<button id="el2">choose file...</button>
<div id="el3"></div>
</div>
</div>
</body>
<script src="app.js"></script>
</html>

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examples/file-upload-single-post/Makefile Normal file
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PROG ?= example
all: $(PROG)
$(DEBUGGER) ./$(PROG)
$(PROG):
$(CC) ../../mongoose.c -I../.. $(CFLAGS) $(EXTRA) -o $(PROG) main.c
clean:
rm -rf $(PROG) *.o *.dSYM *.gcov *.gcno *.gcda *.obj *.exe *.ilk *.pdb log.txt

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examples/file-upload-single-post/README.md Normal file
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See detailed tutorial at https://mongoose.ws/tutorials/file-uploads/

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examples/file-upload/main.c → examples/file-upload-single-post/main.c
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examples/file-upload/web_root/index.html → examples/file-upload-single-post/web_root/index.html
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