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Overview
| Comment: | Update the fileupload.tcl example so that uploaded images are shown in-line. This demonstrates how to use the TCL "binary encode" command to generate base64 from the raw image content and how to modify content-security-policy to allow "data:" sources for images. |
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| SHA3-256: |
af9968656c9491fa88041b57e247791c |
| User & Date: | drh 2019-03-06 17:44:20 |
Context
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2019-03-06
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| 19:43 | Update the documentation on wapp-subst to acknowledge that command substitution does occur outside of quoted regions. check-in: 72cf27176a user: drh tags: trunk | |
| 19:32 | Alternative implementation of wapp-subst that does not allow command substitution within unquoted sections. Leaf check-in: 627a5a8bbc user: drh tags: new-subst-algorithm | |
| 17:44 | Update the fileupload.tcl example so that uploaded images are shown in-line. This demonstrates how to use the TCL "binary encode" command to generate base64 from the raw image content and how to modify content-security-policy to allow "data:" sources for images. check-in: af9968656c user: drh tags: trunk | |
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2019-03-04
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| 19:18 | Fix the multipart/form-data parser so that it can accept none-file uploads. Add the "fileupload.tcl" example. check-in: cfa2467c17 user: drh tags: trunk | |
Changes
Changes to examples/fileupload.tcl.
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#!/usr/bin/wapptclsh # # This script demonstrates a Wapp application that can accept a file # upload using <input type="file"> # package require wapp proc common-header {} { wapp-trim { <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link href="%url([wapp-param SCRIPT_NAME]/style.css)" rel="stylesheet"> <title>Wapp File-Upload Demo</title> </head> <body> } } proc common-footer {} { wapp-trim { </body> </html> } } proc wapp-default {} { wapp-cache-control max-age=3600 common-header wapp-trim { <h1>Wapp File-Upload Demo</h1> } # NB: You must set enctype="multipart/form-data" on your <form> in order # for file upload to work. wapp-trim { <p><form method="POST" enctype="multipart/form-data"> File To Upload: <input type="file" name="file"><br> ................................................................................ set filename [wapp-param file.filename {}] set content [wapp-param file.content {}] if {$filename!=""} { wapp-trim { <h1>Uploaded File Content</h1> <p>Filename: %html($filename)<br> MIME-Type: %html($mimetype)<br> Content:</p> <blockquote><pre> %html($content) </pre></blockquote> } } common-footer } proc wapp-page-style.css {} { wapp-mimetype text/css wapp-cache-control max-age=3600 wapp-trim { pre { border: 1px solid black; padding: 1ex; } } } wapp-start $argv |
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#!/usr/bin/wapptclsh # # This script demonstrates a Wapp application that can accept a file # upload using <input type="file"> # package require wapp proc wapp-default {} { wapp-content-security-policy {default-src 'self'; img-src 'self' data:} wapp-trim { <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Wapp File-Upload Demo</title> </head> <body> <h1>Wapp File-Upload Demo</h1> } # NB: You must set enctype="multipart/form-data" on your <form> in order # for file upload to work. wapp-trim { <p><form method="POST" enctype="multipart/form-data"> File To Upload: <input type="file" name="file"><br> ................................................................................ set filename [wapp-param file.filename {}] set content [wapp-param file.content {}] if {$filename!=""} { wapp-trim { <h1>Uploaded File Content</h1> <p>Filename: %html($filename)<br> MIME-Type: %html($mimetype)<br> } if {[string match image/* $mimetype]} { # If the mimetype is an image, display the image using an # in-line <img> mark. Note that the content-security-policy # must be changed to allow "data:" for type img-src in order # for this to work. set b64 [binary encode base64 $content] wapp-trim { Content:</p> <blockquote> <img src='data:%html($mimetype);base64,%html($b64)'> </blockquote> } } else { # Anything other than image, just show it as text. wapp-trim { Content:</p> <blockquote><pre> %html($content) </pre></blockquote> } } } wapp-trim { </body> </html> } } wapp-start $argv |