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<!DOCTYPE html>
<html lang="en">
<head>
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<title>Web file manager in less than 100 lines of code</title>
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<div class='vhub' style='margin-top:10px;margin-right:20px;text-align:left;background-color:white;'><a href='https://rimstone-lang.com' style='border-bottom:0px'><img src='https://rimstone-lang.com/rimstone.png' style='width:180px;height:auto'/></a></div><div class='vhub' style='margin-top:10px;'>Web file manager in less than 100 lines of code</div><hr/><br/>
Uploading and download files in web browser is a common task in virtually any web application or service. This article shows how to do this with very little coding - in less than 100 lines of code. The database used is PostgreSQL, and the web server is Nginx.<br/>
<br/>
You will use RimStone as an application server and the programming language. It will run behind the web server. This way end-user cannot talk to your application server directly because all such requests go through the web server, while your back-end application can talk directly to your application server for better performance.<br/>
<br/>
Assuming your currently logged-on Linux user will own the application, create a source code directory and also create RimStone application named "file-manager":<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_159' class=notranslate>
<span class="Statement">mkdir</span> filemgr
<span class="Statement">cd</span> filemgr
rim <span class="Special">-k</span> file-manager</pre>
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</div><br/>
Next, create PostgreSQL database named "db_file_manager", owned by currently logged-on user (i.e. passwordless setup):<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_161' class=notranslate>
<span class="Statement">echo</span><span class="Constant"> </span><span class="Statement">"</span><span class="Constant">create user </span><span class="PreProc">$(</span><span class="Special">whoami</span><span class="PreProc">)</span><span class="Constant">;</span>
<span class="Constant">create database db_file_manager with owner=</span><span class="PreProc">$(</span><span class="Special">whoami</span><span class="PreProc">)</span><span class="Constant">;</span>
<span class="Constant">grant all on database db_file_manager to </span><span class="PreProc">$(</span><span class="Special">whoami</span><span class="PreProc">)</span><span class="Constant">;</span>
<span class="Constant">\q</span><span class="Statement">"</span><span class="Constant"> </span>| sudo <span class="Special">-u</span> postgres psql</pre>
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</div><br/>
Create database configuration file used by RimStone that describes the database (it's a file "db"):<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_163' class=notranslate>
<span class="Statement">echo</span><span class="Constant"> </span><span class="Statement">"</span><span class="Constant">user=</span><span class="PreProc">$(</span><span class="Special">whoami</span><span class="PreProc">)</span><span class="Constant"> dbname=db_file_manager</span><span class="Statement">"</span><span class="Constant"> </span><span class="Statement">></span> db</pre>
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</div><br/>
Create SQL table that will hold files currently stored on the server:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_165' class=notranslate>
<span class="Statement">echo</span><span class="Constant"> </span><span class="Statement">"</span><span class="Constant">create table if not exists files (fileName varchar(100), localPath varchar(300), extension varchar(10), description varchar(200), fileSize int, fileID bigserial primary key);</span><span class="Statement">"</span><span class="Constant"> </span>| psql <span class="Special">-d</span> db_file_manager</pre>
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</div><br/>
Finally, create source RimStone files. First create "start.rim" file and copy and paste:<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_158' class=notranslate>
<span class="Statement">begin-handler</span> /start<span class="Identifier"> public</span>
<span class="Statement"> @</span><h2>File Manager</h2>
<span class="Statement"> @</span>To manage the uploaded files, <a href="<span class="Statement"><<print-path</span> <span class="Constant">"/list"</span><span class="Statement">>></span>">click here.</a><br/>
<span class="Statement"> @</span><br/>
<span class="Statement"> @</span><form action="<span class="Statement"><<print-path</span> <span class="Constant">"/upload"</span><span class="Statement">>></span>" method="POST" enctype="multipart/form-data">
<span class="Statement"> @</span> <label for="file_description">File description:</label><br>
<span class="Statement"> @</span> <textarea name="filedesc" rows="<span class="Constant">3</span>" columns="<span class="Constant">50</span>"></textarea><br/>
<span class="Statement"> @</span> <br/>
<span class="Statement"> @</span> <label for="filename">File:</label>
<span class="Statement"> @</span> <input type="file" name="file" value=""><br><br>
<span class="Statement"> @</span> <input type="submit" value="Submit">
<span class="Statement"> @</span></form>
<span class="Statement">end-handler</span></pre>
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</div><br/>
Create "list.rim" file and copy and paste:<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_160' class=notranslate>
<span class="Statement">begin-handler</span> /list<span class="Identifier"> public</span>
<span class="Statement"> @</span><h2>List of files</h2>
<span class="Statement"> @</span>To add a file, <a href="<span class="Statement"><<print-path</span> <span class="Constant">"/start"</span><span class="Statement">>></span>">click here</a><br/><br/>
<span class="Statement"> @</span><table border="<span class="Constant">1</span>">
<span class="Statement"> @</span><tr>
<span class="Statement"> @</span> <td>File</td><td>Description</td><td>Size</td><td>Show</td><td>Delete</td>
<span class="Statement"> @</span></tr>
<span class="Statement"> run-query</span> @db= \
<span class="Constant">"select fileName, description, fileSize, fileID from files order by fileSize desc"</span> \
<span class="Type"> output</span> file_name, description<span class="Identifier"> noencode</span>, file_size, file_ID
<span class="Statement"> @</span><tr>
<span class="Statement"> @</span> <td><span class="Statement"><<print-out</span> file_name<span class="Statement"> web-encode>></span></td><td><span class="Statement"><<print-out</span> description<span class="Statement"> web-encode>></span><td><span class="Statement"><<print-out</span> file_size<span class="Statement"> web-encode>></span></td>
<span class="Statement"> @</span> <td><a href="<span class="Statement"><<print-path</span> <span class="Constant">"/download"</span><span class="Statement">>></span>/file_id=<span class="Statement"><<print-out</span> file_ID<span class="Statement"> url-encode>></span>">Show</a></td>
<span class="Statement"> @</span> <td><a href="<span class="Statement"><<print-path</span> <span class="Constant">"/delete"</span><span class="Statement">>></span>/action=confirm/file_id=<span class="Statement"><<print-out</span> file_ID<span class="Statement"> url-encode>></span>">Delete</a></td>
<span class="Statement"> @</span></tr>
<span class="Statement"> end-query</span>
<span class="Statement"> @</span></table>
<span class="Statement">end-handler</span></pre>
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</div><br/>
Create "upload.rim" file and copy and paste:<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_162' class=notranslate>
<span class="Statement">begin-handler</span> /upload<span class="Identifier"> public</span>
<span class="Statement"> get-param</span> filedesc <span class="Comment">// file description from the upload form</span>
<span class="Statement"> get-upload</span> file<span class="Type"> local-file</span> file_location<span class="Type"> size</span> file_size \
<span class="Type"> extension</span> file_ext<span class="Type"> client-file</span> file_filename
<span class="Statement"> @</span><h2>Uploading file</h2>
<span class="Statement"> run-query</span> @db= \
<span class="Constant">"insert into files (fileName, localPath, extension, description, fileSize) </span><span class="Special">\</span>
<span class="Constant"> values ('</span><span class="Special">%s</span><span class="Constant">', '</span><span class="Special">%s</span><span class="Constant">', '</span><span class="Special">%s</span><span class="Constant">', '</span><span class="Special">%s</span><span class="Constant">', '</span><span class="Special">%s</span><span class="Constant">')"</span> \
<span class="Identifier"> input</span> file_filename, file_location, file_ext, filedesc, $file_size
<span class="Statement"> end-query</span>
<span class="Statement"> @</span>File <span class="Statement"><<print-out</span> file_filename<span class="Statement"> web-encode>></span> of size <span class="Statement"><<print-out</span> file_size <span class="Statement">>></span> \
is stored on server at <span class="Statement"><<print-out</span> file_location<span class="Statement"> web-encode>></span>. \
File description is <span class="Statement"><<print-out</span> filedesc<span class="Statement"> web-encode>></span>.<hr/>
<span class="Statement">end-handler</span></pre>
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</div><br/>
Create "download.rim" file and copy and paste:<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_164' class=notranslate>
<span class="Statement">begin-handler</span> /download<span class="Identifier"> public</span>
<span class="Statement"> get-param</span> file_id
<span class="Statement"> run-query</span> @db= \
<span class="Constant">"select localPath,extension from files where fileID='</span><span class="Special">%s</span><span class="Constant">'"</span> \
<span class="Identifier"> input</span> file_id \
<span class="Type"> output</span> local_path, ext \
<span class="Type"> row-count</span> num_files
<span class="Statement"> if-true</span> ext<span class="Identifier"> equal</span> <span class="Constant">".jpg"</span>
<span class="Statement"> send-file</span> local_path<span class="Identifier"> headers content-type</span> <span class="Constant">"image/jpg"</span>
<span class="Statement"> else-if</span> ext<span class="Identifier"> equal</span> <span class="Constant">".png"</span>
<span class="Statement"> send-file</span> local_path<span class="Identifier"> headers content-type</span> <span class="Constant">"image/png"</span>
<span class="Statement"> else-if</span> ext<span class="Identifier"> equal</span> <span class="Constant">".pdf"</span>
<span class="Statement"> send-file</span> local_path<span class="Identifier"> headers content-type</span> <span class="Constant">"application/pdf"</span>
<span class="Statement"> else-if</span>
<span class="Statement"> send-file</span> local_path<span class="Identifier"> headers content-type</span> <span class="Constant">"application/octet-stream"</span><span class="Identifier"> download</span>
<span class="Statement"> end-if</span>
<span class="Statement"> end-query</span>
<span class="Statement"> if-true</span> num_files<span class="Identifier"> not-equal</span> <span class="Constant">1</span>
<span class="Statement"> @</span>Cannot find this file!<hr/>
<span class="Statement"> exit-handler</span>
<span class="Statement"> end-if</span>
<span class="Statement">end-handler</span></pre>
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</div><br/>
Create "delete.rim" file and copy and paste:<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_166' class=notranslate>
<span class="Statement">begin-handler</span> /delete<span class="Identifier"> public</span>
<span class="Statement"> @</span><h2>Delete a file</h2>
<span class="Statement"> get-param</span> action
<span class="Statement"> get-param</span> file_id
<span class="Statement"> run-query</span> @db=<span class="Constant">"select fileName, localPath, description from files where fileID='</span><span class="Special">%s</span><span class="Constant">'"</span><span class="Type"> output</span> file_name, local_path, desc<span class="Identifier"> input</span> file_id
<span class="Statement"> if-true</span> action<span class="Identifier"> equal</span> <span class="Constant">"confirm"</span> <span class="Comment">// get file information to confirm what will be deleted</span>
<span class="Statement"> @</span>Are you sure you want to delete file <span class="Statement"><<print-out</span> file_name<span class="Statement"> web-encode>></span> (<span class="Statement"><<print-out</span> desc<span class="Statement"> web-encode>></span>)? Click <a href="<span class="Statement"><<print-path</span> <span class="Constant">"/delete"</span><span class="Statement">>></span>?action=delete&amp;file_id=<span class="Statement"><<print-out</span> file_id<span class="Statement"> url-encode>></span>">Delete</a> or click the browser's Back button to go back.<br/>
<span class="Statement"> else-if</span> action<span class="Identifier"> equal</span> <span class="Constant">"delete"</span> <span class="Comment">// actual delete file, once confirmed</span>
<span class="Statement"> begin-transaction</span> @db
<span class="Statement"> run-query</span> @db= <span class="Constant">"delete from files where fileID='</span><span class="Special">%s</span><span class="Constant">'"</span><span class="Identifier"> input</span> file_id<span class="Type"> error</span> err<span class="Identifier"> no-loop</span>
<span class="Statement"> if-true</span> err<span class="Identifier"> not-equal</span> <span class="Constant">"0"</span>
<span class="Statement"> @</span>Could not delete the file (error <span class="Statement"><<print-out</span> err<span class="Statement"> web-encode>></span>)
<span class="Statement"> rollback-transaction</span> @db
<span class="Statement"> else-if</span>
<span class="Statement"> delete-file</span> local_path<span class="Type"> status</span> st
<span class="Statement"> if-true</span> st<span class="Identifier"> equal</span> RIM_OKAY
<span class="Statement"> commit-transaction</span> @db
<span class="Statement"> @</span>File deleted. Go back to <a href="<span class="Statement"><<print-path</span> <span class="Constant">"/start"</span><span class="Statement">>></span>">start page</a>
<span class="Statement"> else-if</span>
<span class="Statement"> rollback-transaction</span> @db
<span class="Statement"> @</span>File could not be deleted, error <span class="Statement"><<print-out</span> st<span class="Statement">>></span>
<span class="Statement"> end-if</span>
<span class="Statement"> end-if</span>
<span class="Statement"> else-if</span>
<span class="Statement"> @</span>Unrecognized action <span class="Statement"><<print-out</span> action<span class="Statement"> web-encode>></span>
<span class="Statement"> end-if</span>
<span class="Statement"> end-query</span>
<span class="Statement">end-handler</span></pre>
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</div><br/>
Make the application:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_167' class=notranslate>
rim <span class="Special">-q</span> <span class="Special">--db</span><span class="Statement">=</span>postgres:db</pre>
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</div><br/>
Run your application server:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_168' class=notranslate>
mrim file-manager</pre>
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</div><br/>
A web server sits in front of RimStone application server, so it needs to be setup. This example is for Ubuntu, so edit Nginx config file there:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_169' class=notranslate>
sudo vi /etc/nginx/sites-enabled/default</pre>
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</div><br/>
Add this in "server {}" section ("client_max_body_size" allows for images of typical sizes to be uploaded), replace "your-user" with the name of your OS user:<br/>
<div class='ncode' style='position:relative;padding-right:16px;'>
<pre id='code_157' class=notranslate>
location /file-manager/ { include /etc/nginx/fastcgi_params; fastcgi_pass unix:///home/your-user/.rimstone/apps/file-manager/sock/.sock; }
client_max_body_size 100M;</pre>
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</div><br/>
Restart Nginx:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_170' class=notranslate>
sudo systemctl restart nginx</pre>
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</div><br/>
Go to your web browser, and enter:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_171' class=notranslate>
<a href="http://">http://</a><span class="Constant">127</span>.<span class="Constant">0</span>.<span class="Constant">0</span>.<span class="Constant">1</span>/file-manager/start</pre>
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</div><br/>
This is what the end result looks like. Obviously, we used just bare-bone HTML, but that's not the point here at all. You can use any kind of front-end technology, the point is to demonstrate RimStone as a back-end server for web applications/services.<br/>
<br/>
Here's the home screen, with the form to upload a file and a link to list of files:<br/>
<br/><div class='vimg'><img class='imgs' src='file-manager-home.png' alt='RimStone'></img>
</div><br/>
Listing files:<br/>
<br/><div class='vimg'><img class='imgs' src='file-manager-list.png' alt='RimStone'></img>
</div><br/>
Asking to delete a file:<br/>
<br/><div class='vimg'><img class='imgs' src='file-manager-delete.png' alt='RimStone'></img>
</div><br/>
Confirmation of deletion:<br/>
<br/><div class='vimg'><img class='imgs' src='file-manager-delete-done.png' alt='RimStone'></img>
</div><br/>
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