Properly encode / sanitize URL's (Example: authorization_endpoint)

[michaelstingl]

Pre-submission Checks

• I checked for similar issues, but could not find any. I also checked the closed issues. I could not contribute additional information to any existing issue.
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Describe the bug

ownCloud Desktop sync client generates invalid URL's with Space characters:

https://keycloak.ocis-keycloak.latest.owncloud.works/realms/oCIS/protocol/openid-connect/auth?response_type=code
&client_id=c604798c-7977-46a5-8beb-e3df13e65413
&redirect_uri=http://127.0.0.1:54213
&code_challenge=5G3yQGITsH_CPkQDIXL7irH5rEN_BydI3s0YOCr7fHs
&code_challenge_method=S256
&scope=openid offline_access email profile
&prompt=select_account consent
&state=G_jOhNJru34iqmG1ULYA04Gd7GYY7ubu22z-gkmPyzg%3D

Expected behavior

URL's should be properly encoded / sanitized.

Steps to reproduce the issue

No response

Screenshots

Logs

No response

Client version number

ownCloud 6.0.0.13116-daily20240115 [0d34c9](https://github.com/owncloud/client/commit/0d34c9844f69cba89b687ee093b2838bf1114647)
Libraries Qt 6.6.0, OpenSSL 3.1.4 24 Oct 2023
Using virtual files plugin: suffix
OS: macos-23.2.0 (build arch: arm64, CPU arch: arm64)
QPA: cocoa

Desktop environment (Linux only)

No response

Client package version and origin (Linux only)

No response

Installation path (Windows only)

No response

Server information

https://ocis.ocis-keycloak.latest.owncloud.works/

[Log]  ownCloud Web UI 8.0.0-rc.1  (index.html-MZztZoFM.mjs, line 1)
[Log]  Infinite Scale 5.1.0-prealpha+21e4b7d29 Community  (index.html-MZztZoFM.mjs, line 1)

Additional context

Doesn't work in curl:

curl "https://keycloak.ocis-keycloak.latest.owncloud.works/realms/oCIS/protocol/openid-connect/auth?response_type=code&client_id=c604798c-7977-46a5-8beb-e3df13e65413&redirect_uri=http://127.0.0.1:54213&code_challenge=5G3yQGITsH_CPkQDIXL7irH5rEN_BydI3s0YOCr7fHs&code_challenge_method=S256&scope=openid offline_access email profile&prompt=select_account consent&state=G_jOhNJru34iqmG1ULYA04Gd7GYY7ubu22z-gkmPyzg%3D" 
curl: (3) URL rejected: Malformed input to a URL function

curl --version
curl 8.4.0 (x86_64-apple-darwin23.0) libcurl/8.4.0 (SecureTransport) LibreSSL/3.3.6 zlib/1.2.12 nghttp2/1.55.1
Release-Date: 2023-10-11
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS GSS-API HSTS HTTP2 HTTPS-proxy IPv6 Kerberos Largefile libz MultiSSL NTLM NTLM_WB SPNEGO SSL threadsafe UnixSockets

[michaelstingl]

Isn't there some Qt magic we can use?

[TheOneRing]

Isn't there some Qt magic we can use?

Encoding a url is no magic.

[saw-jan]

Tested with ownCloud 6.0.0.13239-daily20240202 [149151]

encoded URL: white spaces are encoded

https://ocis.owncloud.com/signin/v1/identifier/_/authorize?
response_type=code&
client_id=xdXOt13JKxym1B1QcEncf2XDkLAexMBFwiT9j6EfhhHFJhs2KM9jbjTmf8JBXE69&
redirect_uri=http://127.0.0.1:42941&
code_challenge=s7-HFF9KTtGKzd1jZ1Y_Zz8uaIc3IZ7gbljHZKKN9bo&
code_challenge_method=S256&
scope=openid%20offline_access%20email%20profile&
prompt=select_account%20consent&
state=hLuInZ2ZLIOWNVAiJ1yyIR3UBkyymJg87ob_YbnVUsY%3D