HTTP Class Technical Documentation (diff)

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1		# HTTP Class Technical Documentation
2
3		## Overview
4
5		The `Http` class (`src/class/http.php`) is a core component of the WackoWiki system responsible for handling HTTP request/response processing, session management, caching, and security features. This class acts as a bridge between the web server and the wiki engine.
6
7		File Location: `src/class/http.php`
	1	== HTTP Class Technical Documentation ==
	2
	3	{{toc numerate=1}}
	4	=== Overview ===
	5
	6	The ##Http## class (##src/class/http.php##) is a core component of the WackoWiki system responsible for handling HTTP request/response processing, session management, caching, and security features. This class acts as a bridge between the web server and the wiki engine.
	7
	8	File Location: ##src/class/http.php##
8	9	Language: PHP
9		Dependencies: Database class, Session classes, Utility classes (`Ut`), Diagnostics class (`Diag`)
10
11		---
12
13		## Class Properties
14
15		### Public Properties
16
17		\| Property \| Type \| Description \|
18		\|----------\|------\|-------------\|
19		\| `$tls_session` \| bool \| Indicates if the current session uses HTTPS/TLS encryption \|
20		\| `$request_uri` \| string \| Normalized REQUEST_URI (e.g., 'PageOfNoReturn/show?a=1') \|
21		\| `$ip` \| string \| Client's real IP address (accounts for proxies) \|
22		\| `$sess` \| Session \| Reference to the Session object \|
23		\| `$method` \| string \| Current HTTP method/request type \|
24
25		### Private Properties
26
27		\| Property \| Type \| Description \|
28		\|----------\|------\|-------------\|
29		\| `$db` \| object \| Database connection reference \|
30		\| `$tls_mark` \| string \| Cookie name for TLS session marking \|
31		\| `$page` \| string \| Current page name being processed \|
32		\| `$hash` \| string \| SHA1 hash of the page name \|
33		\| `$query` \| string \| Encoded query string \|
34		\| `$lang` \| string \| Current language code \|
35		\| `$file` \| string \| Cache file path \|
36		\| `$caching` \| int \| Flag indicating if page should be cached (0 or 1) \|
37
38		---
39
40		## Constructor
41
42		```php
	10	Dependencies: Database class, Session classes, Utility classes (##Ut##), Diagnostics class (##Diag##)
	11
	12	----
	13
	14	=== Class Properties ===
	15
	16	====Public Properties====
	17
	18	#\|
	19	\| Property \| Type \| Description \|
	20	\|\| ##$tls_session## \| bool \| Indicates if the current session uses HTTPS/TLS encryption \|\|
	21	\|\| ##$request_uri## \| string \| Normalized REQUEST_URI (e.g., 'PageOfNoReturn/show?a=1') \|\|
	22	\|\| ##$ip## \| string \| Client's real IP address (accounts for proxies) \|\|
	23	\|\| ##$sess## \| Session \| Reference to the Session object \|\|
	24	\|\| ##$method## \| string \| Current HTTP method/request type \|\|
	25	\|#
	26
	27	====Private Properties====
	28
	29	#\|
	30	\| Property \| Type \| Description \|
	31	\|\| ##$db## \| object \| Database connection reference \|\|
	32	\|\| ##$tls_mark## \| string \| Cookie name for TLS session marking \|\|
	33	\|\| ##$page## \| string \| Current page name being processed \|\|
	34	\|\| ##$hash## \| string \| SHA1 hash of the page name \|\|
	35	\|\| ##$query## \| string \| Encoded query string \|\|
	36	\|\| ##$lang## \| string \| Current language code \|\|
	37	\|\| ##$file## \| string \| Cache file path \|\|
	38	\|\| ##$caching## \| int \| Flag indicating if page should be cached (0 or 1) \|\|
	39	\|#
	40
	41	----
	42	=== Constructor ===
	43
	44	%%php
43	45	public function __construct(&$db)
44		~~```~~
	46	%%
45	47
46	48	Purpose: Initializes the Http object and sets up HTTP session handling.
47	49
48	50	Parameters:
49		~~- `$db`~~ - Database object reference
	51	- ##$db## - Database object reference
50	52
51	53	Initialization Steps:
52		1. Stores database reference
53		2. Extracts and normalizes REQUEST_URI
54		3. Detects TLS/HTTPS session status
55		4. Determines client's real IP address
56		5. Sets up TLS mark cookie name
57		6. Enforces TLS session upgrade if needed
58
59		Example:
60		~~```~~php
	54	1. Stores database reference
	55	2. Extracts and normalizes REQUEST_URI
	56	3. Detects TLS/HTTPS session status
	57	4. Determines client's real IP address
	58	5. Sets up TLS mark cookie name
	59	6. Enforces TLS session upgrade if needed
	60
	61	Example:
	62	%%php
61	63	$http = new Http($db);
62		~~```~~
63
64		---
65
66		~~## Core Methods~~
67
68		~~### Session Management~~
69
70		~~#### `session($route): void`~~
	64	%%
	65
	66	----
	67
	68	=== Core Methods ===
	69
	70	==== Session Management ====
	71
	72	===== ##session($route): void## =====
71	73	Initializes the session handler (file-based or database-based).
72	74
73	75	Parameters:
74		~~- `$route`~~ (int) - Routing flag:
75		- Bit 2 (~~`$route & 2`~~): Enable static mode for files/freecap (disables replay prevention and ID regeneration)
76
77		Features:
78		- Selects storage backend (file or database)
79		- Configures cookie settings (security, path, httponly)
80		- Binds IP and TLS validation
81		- Recovers diagnostic logs from previous session
82
83		Example:
84		~~```~~php
	76	- ##$route## (int) - Routing flag:
	77	- Bit 2 (##$route & 2##): Enable static mode for files/freecap (disables replay prevention and ID regeneration)
	78
	79	Features:
	80	- Selects storage backend (file or database)
	81	- Configures cookie settings (security, path, httponly)
	82	- Binds IP and TLS validation
	83	- Recovers diagnostic logs from previous session
	84
	85	Example:
	86	%%php
85	87	$http->session(0); // Normal session
86	88	$http->session(2); // Static file serving mode
87		~~```~~
88
89		---
90
91		~~### Caching System~~
92
93		~~#### `check_cache($page, $method): void`~~
	89	%%
	90
	91	----
	92
	93	==== Caching System ====
	94
	95	===== ##check_cache($page, $method): void## =====
94	96	Determines if a page can be cached and prepares the cache check.
95	97
96	98	Parameters:
97		~~- `$page`~~ (string) - Page name to cache
98		~~- `$method`~~ (string) - Request method/action (e.g., 'show', 'edit')
	99	- ##$page## (string) - Page name to cache
	100	- ##$method## (string) - Request method/action (e.g., 'show', 'edit')
99	101
100	102	Caching Rules:
101		- ✅ Enabled for GET requests only
102		- ✅ Disabled for POST requests
103		- ❌ Never cached for 'edit' or 'watch' methods
104		- ✅ Only cached for anonymous users (no logged-in users)
105
106		Example:
107		~~```~~php
	103	- ✅ Enabled for GET requests only
	104	- ✅ Disabled for POST requests
	105	- ❌ Never cached for 'edit' or 'watch' methods
	106	- ✅ Only cached for anonymous users (no logged-in users)
	107
	108	Example:
	109	%%php
108	110	$http->check_cache('HomePage', 'show');
109		~~```~~
110
111		---
112
113		~~#### `store_cache(): void`~~
	111	%%
	112
	113	----
	114
	115	=====##store_cache(): void##=====
114	116	Saves the generated page content to cache file.
115	117
116	118	Features:
117		- Retrieves output buffer content
118		- Saves to cache file with proper permissions
119		- Records cache metadata in database
120		- Only executes if caching flag is set and user is anonymous
121
122		Example:
123		~~```php~~
	119	- Retrieves output buffer content
	120	- Saves to cache file with proper permissions
	121	- Records cache metadata in database
	122	- Only executes if caching flag is set and user is anonymous
	123
	124	Example:
	125	%%(hl php)
124	126	// Called at end of page rendering
125	127	$http->store_cache();
126		~~```~~
127
128		---
129
130		~~#### `invalidate_page($page): int`~~
	128	%%
	129
	130	----
	131
	132	===== ##invalidate_page($page): int## =====
131	133	Invalidates all cached versions of a page.
132	134
133	135	Parameters:
134		~~- `$page`~~ (string) - Page name to invalidate
	136	- ##$page## (string) - Page name to invalidate
135	137
136	138	Returns:
137		- Number of cache entries invalidated
	139	- Number of cache entries invalidated
138	140
139	141	Process:
140		1. Finds all cached versions (different methods/languages)
141		2. Touches files to past timestamp (faster than deletion)
142		3. Removes entries from cache metadata table
143		4. Returns count of invalidated caches
144
145		Example:
146		~~```~~php
	142	1. Finds all cached versions (different methods/languages)
	143	2. Touches files to past timestamp (faster than deletion)
	144	3. Removes entries from cache metadata table
	145	4. Returns count of invalidated caches
	146
	147	Example:
	148	%%php
147	149	$count = $http->invalidate_page('HomePage');
148	150	echo "Invalidated $count cache entries";
149		~~```~~
150
151		---
152
153		~~### TLS/HTTPS Security~~
154
155		~~#### `secure_base_url(): void`~~
	151	%%
	152
	153	----
	154
	155	==== TLS/HTTPS Security ====
	156
	157	===== ##secure_base_url(): void## =====
156	158	Switches base URL from HTTP to HTTPS.
157	159
158	160	Purpose:
159		- Ensures all subsequent URLs use HTTPS
160		- Stores original HTTP URL for fallback
161		- Called when TLS session is detected
162
163		Example:
164		~~```~~php
	161	- Ensures all subsequent URLs use HTTPS
	162	- Stores original HTTP URL for fallback
	163	- Called when TLS session is detected
	164
	165	Example:
	166	%%php
165	167	$http->secure_base_url();
166	168	// $db->base_url now uses https://
167		~~```~~
168
169		---
170
171		~~#### `ensure_tls($url): void`~~
	169	%%
	170
	171	----
	172
	173	===== ##ensure_tls($url): void## =====
172	174	Enforces HTTPS for a specific URL and redirects if necessary.
173	175
174	176	Parameters:
175		~~- `$url`~~ (string) - URL to secure
	177	- ##$url## (string) - URL to secure
176	178
177	179	Behavior:
178		- If not already HTTPS and TLS is enabled, forces HTTPS redirect
179		- Handles both relative and absolute URLs
180		- Converts relative URLs using current server name
181
182		Example:
183		~~```~~php
	180	- If not already HTTPS and TLS is enabled, forces HTTPS redirect
	181	- Handles both relative and absolute URLs
	182	- Converts relative URLs using current server name
	183
	184	Example:
	185	%%php
184	186	$http->ensure_tls('/secure/payment');
185		~~```~~
186
187		---
188
189		~~### IP Address Detection~~
190
191		~~#### `real_ip(): string` (Private)~~
	187	%%
	188
	189	----
	190
	191	==== IP Address Detection ====
	192
	193	===== ##real_ip(): string## (Private) =====
192	194	Detects client's real IP address accounting for proxies.
193	195
194	196	Proxy Headers Checked (in order):
195		~~1. `HTTP_X_CLUSTER_CLIENT_IP`~~
196		~~2. `HTTP_X_FORWARDED_FOR`~~ (or custom header)
197		~~3. `HTTP_CLIENT_IP`~~
198		~~4. `HTTP_X_REMOTE_ADDR`~~
199		~~5. `REMOTE_ADDR`~~ (fallback)
200
201		Features:
202		- Filters out private/reserved IP ranges
203		- Respects configured reverse proxy addresses
204		~~- Returns `'0.0.0.0'`~~ as fallback
	197	1. ##HTTP_X_CLUSTER_CLIENT_IP##
	198	2. ##HTTP_X_FORWARDED_FOR## (or custom header)
	199	3. ##HTTP_CLIENT_IP##
	200	4. ##HTTP_X_REMOTE_ADDR##
	201	5. ##REMOTE_ADDR## (fallback)
	202
	203	Features:
	204	- Filters out private/reserved IP ranges
	205	- Respects configured reverse proxy addresses
	206	- Returns ##'0.0.0.0'## as fallback
205	207
206	208	Configuration in Database:
207		~~- `reverse_proxy_addresses`~~ - Comma/space-separated proxy IPs
208		~~- `reverse_proxy_header` - Custom header name (default: `X-Forwarded-For`~~)
209
210		Example:
211		~~```~~php
	209	- ##reverse_proxy_addresses## - Comma/space-separated proxy IPs
	210	- ##reverse_proxy_header## - Custom header name (default: ##X-Forwarded-For##)
	211
	212	Example:
	213	%%php
212	214	$client_ip = $http->ip; // e.g., "203.0.113.42"
213		~~```~~
214
215		---
216
217		~~### HTTPS Detection~~
218
219		~~#### `tls_session(): bool` (Private)~~
	215	%%
	216
	217	----
	218
	219	==== HTTPS Detection ====
	220
	221	===== ##tls_session(): bool## (Private) =====
220	222	Detects if current connection uses HTTPS/TLS.
221	223
222	224	Checks (any being true = HTTPS):
223		- `$_SERVER['HTTPS']` is 'on'
224		- `$_SERVER['SERVER_PORT']` is 443
225		- `$_SERVER['HTTP_X_FORWARDED_PROTO']` is 'https'
226		- `$_SERVER['HTTP_X_FORWARDED_SSL']` is 'on'
227		- `$_SERVER['HTTP_X_FORWARDED_PORT']` is 443
228
229		---
230
231		### Security Headers
232
233		#### `http_security_headers(): void`
	225	- ##$_SERVER['HTTPS']## is 'on'
	226	- ##$_SERVER['SERVER_PORT']## is 443
	227	- ##$_SERVER['HTTP_X_FORWARDED_PROTO']## is 'https'
	228	- ##$_SERVER['HTTP_X_FORWARDED_SSL']## is 'on'
	229	- ##$_SERVER['HTTP_X_FORWARDED_PORT']## is 443
	230
	231	----
	232
	233	==== Security Headers ====
	234
	235	=====##http_security_headers(): void##=====
	236
234	237	Sets security-related HTTP headers.
235	238
236	239	Headers Set:
237	240
238		\| Header \| Purpose \| Config Key \|
239		\|--------\|---------\|------------\|
240		\| Content-Security-Policy \| XSS/injection protection \| `csp` \|
241		\| Permissions-Policy \| Control browser features \| `permissions_policy` \|
242		\| Referrer-Policy \| Control referrer information \| `referrer_policy` \|
243		\| Strict-Transport-Security \| Force HTTPS \| Auto (TLS only) \|
244		\| X-Frame-Options \| Clickjacking protection \| Hardcoded: `SAMEORIGIN` \|
245		\| X-Content-Type-Options \| MIME sniffing prevention \| Hardcoded: `nosniff` \|
	241	#\|
	242	\| Header \| Purpose \| Config Key \|
	243	\|\| Content-Security-Policy \| XSS/injection protection \| ##csp## \|\|
	244	\|\| Permissions-Policy \| Control browser features \| ##permissions_policy## \|\|
	245	\|\| Referrer-Policy \| Control referrer information \| ##referrer_policy## \|\|
	246	\|\| Strict-Transport-Security \| Force HTTPS \| Auto (TLS only) \|\|
	247	\|\| X-Frame-Options \| Clickjacking protection \| Hardcoded: ##SAMEORIGIN## \|\|
	248	\|\| X-Content-Type-Options \| MIME sniffing prevention \| Hardcoded: ##nosniff## \|\|
	249	\|#
246	250
247	251	CSP Configuration Options:
248		~~- `0`~~ - Disabled
249		~~- `1` - Default policy (from `csp.conf`~~)
250		~~- `2` - Custom policy (from `csp_custom.conf`~~)
251
252		Example:
253		~~```~~php
	252	- ##0## - Disabled
	253	- ##1## - Default policy (from ##csp.conf##)
	254	- ##2## - Custom policy (from ##csp_custom.conf##)
	255
	256	Example:
	257	%%php
254	258	$http->http_security_headers();
255		```
256
257		---
258
259		### HTTP Methods
260
261		#### `redirect($url, $permanent = false): void`
	259	%%
	260
	261	----
	262	==== HTTP Methods ====
	263
	264	===== ##redirect($url, $permanent = false): void## =====
262	265	Performs an HTTP redirect.
263	266
264	267	Parameters:
265		~~- `$url`~~ (string) - Target URL
266		~~- `$permanent`~~ (bool) - Use 301 (permanent) vs 302 (temporary)
267
268		Features:
269		~~- Decodes `&`~~ entities to prevent broken redirects
270		- Only works if headers not yet sent
271		- Uses output buffering to work anywhere in page processing
272
273		Example:
274		~~```~~php
	268	- ##$url## (string) - Target URL
	269	- ##$permanent## (bool) - Use 301 (permanent) vs 302 (temporary)
	270
	271	Features:
	272	- Decodes ##&## entities to prevent broken redirects
	273	- Only works if headers not yet sent
	274	- Uses output buffering to work anywhere in page processing
	275
	276	Example:
	277	%%php
275	278	$http->redirect('http://example.com/new-page', true); // 301
276	279	$http->redirect('/wiki/HomePage'); // 302
277		~~```~~
278
279		---
280
281		~~#### `terminate(): void`~~
	280	%%
	281
	282	----
	283
	284	===== ##terminate(): void## =====
282	285	Safe exit/die with cleanup.
283	286
284	287	Cleanup Operations:
285		- Saves diagnostic logs to session flash data
286		- Ends script execution
287
288		Example:
289		~~```~~php
	288	- Saves diagnostic logs to session flash data
	289	- Ends script execution
	290
	291	Example:
	292	%%php
290	293	$http->terminate();
291		~~```~~
292
293		---
294
295		~~#### `status($code): void`~~
	294	%%
	295
	296	----
	297
	298	===== ##status($code): void## =====
296	299	Sets HTTP response status code.
297	300
298	301	Supported Status Codes:
299		~~```~~php
	302	%%php
300	303	200 => 'OK'
301	304	206 => 'Partial Content'
302	305	301 => 'Moved Permanently'
…	…	…
313	316	500 => 'Internal Server Error'
314	317	501 => 'Not Implemented'
315	318	503 => 'Service Unavailable'
316		~~```~~
317
318		Example:
319		~~```~~php
	319	%%
	320
	321	Example:
	322	%%php
320	323	$http->status(404); // Send 404 Not Found
321		~~```~~
322
323		---
324
325		~~### Caching Control~~
326
327		~~#### `no_cache($client_only = true): void`~~
	324	%%
	325
	326	----
	327
	328	==== Caching Control ====
	329
	330	===== ##no_cache($client_only = true): void## =====
328	331	Disables caching of the current page.
329	332
330	333	Parameters:
331		~~- `$client_only`~~ (bool, default: TRUE)
332		- ~~`TRUE`~~: Disable browser cache only
333		- ~~`FALSE`~~: Disable both browser and server cache
	334	- ##$client_only## (bool, default: TRUE)
	335	- ##TRUE##: Disable browser cache only
	336	- ##FALSE##: Disable both browser and server cache
334	337
335	338	Headers Set:
336		~~- `Last-Modified: <current-time>`~~ (always fresh)
337		~~- `Cache-Control: no-store`~~
338
339		Example:
340		~~```~~php
	339	- ##Last-Modified: <current-time>## (always fresh)
	340	- ##Cache-Control: no-store##
	341
	342	Example:
	343	%%php
341	344	$http->no_cache(); // Client-side only
342	345	$http->no_cache(false); // Both client & server
343		~~```~~
344
345		---
346
347		~~#### `cache_promisc(): void`~~
	346	%%
	347
	348	----
	349
	350	===== ##cache_promisc(): void## =====
348	351	Marks page as publicly cacheable.
349	352
350	353	Headers Set:
351		~~- `Cache-Control: public`~~
352
353		Example:
354		~~```~~php
	354	- ##Cache-Control: public##
	355
	356	Example:
	357	%%php
355	358	$http->cache_promisc();
356		~~```~~
357
358		---
359
360		~~### Language Negotiation~~
361
362		~~#### `user_agent_language(): string`~~
	359	%%
	360
	361	----
	362
	363	==== Language Negotiation ====
	364
	365	===== ##user_agent_language(): string## =====
363	366	Determines best language based on browser preferences.
364	367
365	368	Features:
366		- Follows RFC 9110 section 12.5.4 (HTTP Accept-Language)
367		~~- Parses `Accept-Language`~~ header with quality factors
368		- Attempts exact match first, then language fallback
369		- Falls back to default system language
	369	- Follows RFC 9110 section 12.5.4 (HTTP Accept-Language)
	370	- Parses ##Accept-Language## header with quality factors
	371	- Attempts exact match first, then language fallback
	372	- Falls back to default system language
370	373
371	374	Example Header:
372		~~```~~
	375	%%
373	376	Accept-Language: en-US,en;q=0.9,de;q=0.8
374		~~```~~
	377	%%
375	378
376	379	Returns:
377		- Language code (e.g., 'en', 'en-US', 'de')
378
379		---
380
381		~~#### `available_languages($subset = true): array`~~
	380	- Language code (e.g., 'en', 'en-US', 'de')
	381
	382	----
	383
	384	===== ##available_languages($subset = true): array## =====
382	385	Returns list of available language translations.
383	386
384	387	Parameters:
385		~~- `$subset`~~ (bool, default: TRUE)
386		- ~~`TRUE`~~: Only allowed languages
387		- ~~`FALSE`~~: All available languages
388
389		Features:
390		~~- Scans `LANG_DIR`~~ for language files
391		~~- Filters by `allowed_languages`~~ config if set
392		- Caches result in session
393		- System language always included
	388	- ##$subset## (bool, default: TRUE)
	389	- ##TRUE##: Only allowed languages
	390	- ##FALSE##: All available languages
	391
	392	Features:
	393	- Scans ##LANG_DIR## for language files
	394	- Filters by ##allowed_languages## config if set
	395	- Caches result in session
	396	- System language always included
394	397
395	398	Returns:
396		~~- Associative array: `['en' => 'en', 'de' => 'de', ...]`~~
397
398		Example:
399		~~```~~php
	399	- Associative array: ##['en' => 'en', 'de' => 'de', ...]##
	400
	401	Example:
	402	%%php
400	403	$all_langs = $http->available_languages(false);
401	404	$allowed = $http->available_languages(true);
402		~~```~~
403
404		---
405
406		~~### File Serving~~
407
408		~~#### `sendfile($path, $filename = null, $age = null): void`~~
	405	%%
	406
	407	----
	408
	409	==== File Serving ====
	410
	411	===== ##sendfile($path, $filename = null, $age = null): void## =====
409	412	Serves files with proper HTTP headers and caching.
410	413
411	414	Parameters:
412		~~- `$path`~~ (string) - File path (or HTTP_XXX constant for error pages)
413		~~- `$filename`~~ (string, optional) - Custom download filename
414		~~- `$age`~~ (int, optional) - Cache age in days
415
416		Features:
417		- HTTP range request support (partial file downloads)
418		- ETag and Last-Modified conditional requests
419		- Proper MIME type detection
420		- Content-Security-Policy for special file types
421		- Streaming for large files
422		- GZip compression for text files
	415	- ##$path## (string) - File path (or HTTP_XXX constant for error pages)
	416	- ##$filename## (string, optional) - Custom download filename
	417	- ##$age## (int, optional) - Cache age in days
	418
	419	Features:
	420	- HTTP range request support (partial file downloads)
	421	- ETag and Last-Modified conditional requests
	422	- Proper MIME type detection
	423	- Content-Security-Policy for special file types
	424	- Streaming for large files
	425	- GZip compression for text files
423	426
424	427	Special Paths:
425		~~```~~php
	428	%%php
426	429	$http->sendfile(404); // Serves file defined by HTTP_404 constant
427	430	$http->sendfile(403); // Serves file defined by HTTP_403 constant
428		~~```~~
429
430		Example:
431		~~```~~php
	431	%%
	432
	433	Example:
	434	%%php
432	435	$http->sendfile('uploads/document.pdf', 'my-document.pdf', 30);
433		~~```~~
434
435		---
436
437		~~#### `mime_type($path): string`~~
	436	%%
	437
	438	----
	439
	440	===== ##mime_type($path): string## =====
438	441	Returns MIME type for a file.
439	442
440	443	Returns:
441		- MIME type string (e.g., 'application/pdf')
442		~~- Default: `'application/octet-stream'`~~
443
444		Example:
445		~~```~~php
	444	- MIME type string (e.g., 'application/pdf')
	445	- Default: ##'application/octet-stream'##
	446
	447	Example:
	448	%%php
446	449	$mime = $http->mime_type('file.pdf'); // 'application/pdf'
447		~~```~~
448
449		---
450
451		~~#### `mime_types(): array` (Private)~~
	450	%%
	451
	452	----
	453
	454	===== ##mime_types(): array## (Private) =====
452	455	Loads and caches MIME types from configuration.
453	456
454	457	Features:
455		~~- Reads from `config/mime.types`~~
456		~~- Caches to `cache/config/mime.types`~~
457		- Reloads if config is updated
458
459		---
460
461		~~### Compression~~
462
463		~~#### `gzip(): void`~~
	458	- Reads from ##config/mime.types##
	459	- Caches to ##cache/config/mime.types##
	460	- Reloads if config is updated
	461
	462	----
	463
	464	==== Compression ====
	465
	466	===== ##gzip(): void## =====
464	467	Compresses HTTP response with gzip/x-gzip.
465	468
466	469	Features:
467		- Manually implements gzip (not relying on zlib.output_compression)
468		~~- Produces correct `Content-Length`~~ header
469		- Only compresses if:
	470	- Manually implements gzip (not relying on zlib.output_compression)
	471	- Produces correct ##Content-Length## header
	472	- Only compresses if:
470	473	- 860 bytes < content < 1 MB
471	474	- Client accepts compression
472	475	- Headers not already sent
473	476
474	477	Example:
475		~~```~~php
	478	%%php
476	479	$http->gzip();
477		~~```~~
478
479		---
480
481		~~### Utility Methods~~
482
483		~~#### `parse_str($str): array` (Private)~~
	480	%%
	481
	482	----
	483
	484	==== Utility Methods ====
	485
	486	===== ##parse_str($str): array## (Private) =====
484	487	Parses URL-encoded strings with special character handling.
485	488
486	489	Purpose:
487		- Safely handles special characters in query/form data
488		- Converts encoding properly
489
490		Example:
491		~~```~~php
	490	- Safely handles special characters in query/form data
	491	- Converts encoding properly
	492
	493	Example:
	494	%%php
492	495	$data = $http->parse_str('name=John&age=30');
493		~~```~~
494
495		---
496
497		~~#### `request_uri(): string` (Private)~~
	496	%%
	497
	498	----
	499
	500	===== ##request_uri(): string## (Private) =====
498	501	Extracts and normalizes REQUEST_URI from server.
499	502
500	503	Normalization:
501		- Removes base URL prefix
502		- Removes spaces
503		- Collapses multiple slashes
504		~~- Removes `..`~~ path traversal attempts
505		- Removes leading/trailing slashes
506
507		---
508
509		~~#### `cut_prefix($prefix, $path): string` (Private)~~
	504	- Removes base URL prefix
	505	- Removes spaces
	506	- Collapses multiple slashes
	507	- Removes ##..## path traversal attempts
	508	- Removes leading/trailing slashes
	509
	510	----
	511
	512	===== ##cut_prefix($prefix, $path): string## (Private) =====
510	513	Removes prefix from path (case-insensitive).
511	514
512		---
513
514		~~#### `get_header_conf($file_name): string` (Private)~~
	515	----
	516
	517	===== ##get_header_conf($file_name): string## (Private) =====
515	518	Loads security header configuration from files.
516	519
517	520	Files Supported:
518		~~- `csp.conf` / `csp_custom.conf`~~
519		~~- `permissions_policy.conf` / `permissions_policy_custom.conf`~~
520
521		---
522
523		~~## Configuration Dependencies~~
	521	- ##csp.conf## / ##csp_custom.conf##
	522	- ##permissions_policy.conf## / ##permissions_policy_custom.conf##
	523
	524	----
	525
	526	===Configuration Dependencies===
524	527
525	528	The class relies on these database configuration settings:
526	529
527		\| Setting \| Type \| Purpose \|
528		\|---------\|------\|---------\|
529		\| `base_url` \| string \| Wiki's base URL \|
530		\| `tls` \| bool \| Enable HTTPS enforcement \|
531		\| `cache` \| bool \| Enable page caching \|
532		\| `cache_ttl` \| int \| Cache lifetime in seconds \|
533		\| `session_store` \| int \| 1=File, 0=Database \|
534		\| `system_seed_hash` \| string \| Session encryption seed \|
535		\| `cookie_prefix` \| string \| Session cookie prefix \|
536		\| `cookie_path` \| string \| Cookie path \|
537		\| `allow_persistent_cookie` \| bool \| Allow persistent login \|
538		\| `session_length` \| int \| Session lifetime in seconds \|
539		\| `reverse_proxy_addresses` \| string \| Comma/space-separated proxy IPs \|
540		\| `reverse_proxy_header` \| string \| Custom X-Forwarded header \|
541		\| `language` \| string \| Default language code \|
542		\| `multilanguage` \| bool \| Enable language negotiation \|
543		\| `allowed_languages` \| string \| Comma/space-separated allowed langs \|
544		\| `enable_security_headers` \| bool \| Send security headers \|
545		\| `csp` \| int \| CSP setting (0/1/2) \|
546		\| `permissions_policy` \| int \| Permissions-Policy setting (0/1/2) \|
547		\| `referrer_policy` \| int \| Referrer-Policy setting (0-8) \|
548
549		---
550
551		## Constants Used
552
553		\| Constant \| Type \| Purpose \|
554		\|----------\|------\|---------\|
555		\| `IN_WACKO` \| bool \| Security check (exit if not defined) \|
556		\| `CHMOD_SAFE` \| int \| File permissions for cache files \|
557		\| `CHMOD_FILE` \| int \| File permissions for config cache \|
558		\| `CACHE_PAGE_DIR` \| string \| Page cache directory \|
559		\| `CACHE_SESSION_DIR` \| string \| Session cache directory \|
560		\| `CACHE_CONFIG_DIR` \| string \| Config cache directory \|
561		\| `CONFIG_DIR` \| string \| Configuration directory \|
562		\| `LANG_DIR` \| string \| Language files directory \|
563		\| `DAYSECS` \| int \| Seconds in a day (86400) \|
564		\| `HTTP_404` \| string \| Path to 404 error page \|
565		\| `HTTP_403` \| string \| Path to 403 error page \|
566
567		---
568
569		## Workflow Examples
570
571		### Example 1: Handling a GET Request
572
573		```php
	530	#\|
	531	\| Setting \| Type \| Purpose \|
	532	\|\| ##base_url## \| string \| Wiki's base URL \|\|
	533	\|\| ##tls## \| bool \| Enable HTTPS enforcement \|\|
	534	\|\| ##cache## \| bool \| Enable page caching \|\|
	535	\|\| ##cache_ttl## \| int \| Cache lifetime in seconds \|\|
	536	\|\| ##session_store## \| int \| 1=File, 0=Database \|\|
	537	\|\| ##system_seed_hash## \| string \| Session encryption seed \|\|
	538	\|\| ##cookie_prefix## \| string \| Session cookie prefix \|\|
	539	\|\| ##cookie_path## \| string \| Cookie path \|\|
	540	\|\| ##allow_persistent_cookie## \| bool \| Allow persistent login \|\|
	541	\|\| ##session_length## \| int \| Session lifetime in seconds \|\|
	542	\|\| ##reverse_proxy_addresses## \| string \| Comma/space-separated proxy IPs \|\|
	543	\|\| ##reverse_proxy_header## \| string \| Custom X-Forwarded header \|\|
	544	\|\| ##language## \| string \| Default language code \|\|
	545	\|\| ##multilanguage## \| bool \| Enable language negotiation \|\|
	546	\|\| ##allowed_languages## \| string \| Comma/space-separated allowed langs \|\|
	547	\|\| ##enable_security_headers## \| bool \| Send security headers \|\|
	548	\|\| ##csp## \| int \| CSP setting (0/1/2) \|\|
	549	\|\| ##permissions_policy## \| int \| Permissions-Policy setting (0/1/2) \|\|
	550	\|\| ##referrer_policy## \| int \| Referrer-Policy setting (0-8) \|\|
	551	\|#
	552
	553	----
	554
	555	===Constants Used===
	556
	557	#\|
	558	\| Constant \| Type \| Purpose \|
	559	\|\| ##IN_WACKO## \| bool \| Security check (exit if not defined) \|\|
	560	\|\| ##CHMOD_SAFE## \| int \| File permissions for cache files \|\|
	561	\|\| ##CHMOD_FILE## \| int \| File permissions for config cache \|\|
	562	\|\| ##CACHE_PAGE_DIR## \| string \| Page cache directory \|\|
	563	\|\| ##CACHE_SESSION_DIR## \| string \| Session cache directory \|\|
	564	\|\| ##CACHE_CONFIG_DIR## \| string \| Config cache directory \|\|
	565	\|\| ##CONFIG_DIR## \| string \| Configuration directory \|\|
	566	\|\| ##LANG_DIR## \| string \| Language files directory \|\|
	567	\|\| ##DAYSECS## \| int \| Seconds in a day (86400) \|\|
	568	\|\| ##HTTP_404## \| string \| Path to 404 error page \|\|
	569	\|\| ##HTTP_403## \| string \| Path to 403 error page \|\|
	570	\|#
	571
	572	----
	573
	574	=== Workflow Examples ===
	575
	576	====Example 1: Handling a GET Request====
	577
	578	%%(hl php)
574	579	// In main wiki entry point
575	580	$http = new Http($db);
576	581	$http->session(0); // Start session
…	…	…
588	593
589	594	// Possibly compress output
590	595	$http->gzip();
591		~~```~~
592
593		~~### Example 2: Handling TLS/HTTPS Upgrade~~
594
595		~~```~~php
	596	%%
	597
	598	==== Example 2: Handling TLS/HTTPS Upgrade ====
	599
	600	%%php
596	601	$http = new Http($db); // Constructor detects TLS requirement
597	602	// If TLS is enabled and user wasn't in TLS before:
598	603	// - Sets TLS session flag
599	604	// - Marks session with TLS cookie
600	605	// - Redirects to HTTPS version
601		~~```~~
602
603		~~### Example 3: Invalidating Cache After Page Edit~~
604
605		~~```~~php
	606	%%
	607
	608	==== Example 3: Invalidating Cache After Page Edit ====
	609
	610	%%php
606	611	// User edits a page
607	612	$http = new Http($db);
608	613	$count = $http->invalidate_page('HomePage');
609	614	// All cached versions (different languages, methods) are invalidated
610		~~```~~
611
612		~~### Example 4: Serving a File~~
613
614		~~```~~php
	615	%%
	616
	617	==== Example 4: Serving a File ====
	618
	619	%%php
615	620	$http = new Http($db);
616	621	$http->session(2); // Static file mode - no session replay prevention
617	622
618	623	// Serve with 30-day cache
619	624	$http->sendfile('uploads/manual.pdf', 'user-manual.pdf', 30);
620		~~```~~
621
622		---
623
624		~~## Security Considerations~~
625
626		### 1. IP Address Spoofing
627		- Validates IPs against private ranges
628		- Filters proxy-provided IPs appropriately
629		- Configurable reverse proxy trust
630
631		### 2. Session Security
632		- Binds sessions to IP address
633		- Binds sessions to TLS status
634		- Supports both file and database storage
635		- HttpOnly cookies by default
636
637		### 3. TLS Enforcement
638		- Automatic HTTPS upgrade when configured
639		- Marks TLS sessions to prevent downgrade attacks
640		- HSTS header support
641
642		### 4. Content Security
643		- CSP headers to prevent XSS
644		- X-Frame-Options to prevent clickjacking
645		- X-Content-Type-Options to prevent MIME sniffing
646		- Referrer-Policy control
647		- Permissions-Policy for browser features
648
649		### 5. File Serving
650		- Validates file existence and readability
651		~~- Prevents directory traversal via `realpath()`~~
652		- Rejects symbolic links
653		- Special CSP for SVG and PDF files
654
655		### 6. Cache Security
656		- Cached only for anonymous users
657		- Disabled for sensitive operations (edit, watch)
658		- Only GET requests cached
659
660		---
661
662		~~## Performance Optimization~~
663
664		### 1. Page Caching
665		- Stores full HTML output
666		- TTL-based expiration
667		- Language and method-aware caching
668		- Conditional request support (304 Not Modified)
669
670		### 2. MIME Type Caching
671		- Loads MIME types once and caches
672		- Regenerates only when config changes
673
674		### 3. Session Options
675		- File-based sessions for simple deployments
676		- Database sessions for distributed systems
677
678		### 4. Compression
679		- Manual gzip implementation
680		- Proper Content-Length generation
681		- Only compresses appropriate sizes
682
683		---
684
685		~~## Debugging~~
	625	%%
	626
	627	----
	628
	629	=== Security Considerations ===
	630
	631	==== 1. IP Address Spoofing ====
	632	- Validates IPs against private ranges
	633	- Filters proxy-provided IPs appropriately
	634	- Configurable reverse proxy trust
	635
	636	==== 2. Session Security ====
	637	- Binds sessions to IP address
	638	- Binds sessions to TLS status
	639	- Supports both file and database storage
	640	- HttpOnly cookies by default
	641
	642	==== 3. TLS Enforcement ====
	643	- Automatic HTTPS upgrade when configured
	644	- Marks TLS sessions to prevent downgrade attacks
	645	- HSTS header support
	646
	647	==== 4. Content Security ====
	648	- CSP headers to prevent XSS
	649	- X-Frame-Options to prevent clickjacking
	650	- X-Content-Type-Options to prevent MIME sniffing
	651	- Referrer-Policy control
	652	- Permissions-Policy for browser features
	653
	654	==== 5. File Serving ====
	655	- Validates file existence and readability
	656	- Prevents directory traversal via ##realpath()##
	657	- Rejects symbolic links
	658	- Special CSP for SVG and PDF files
	659
	660	==== 6. Cache Security ====
	661	- Cached only for anonymous users
	662	- Disabled for sensitive operations (edit, watch)
	663	- Only GET requests cached
	664
	665	----
	666
	667	=== Performance Optimization ===
	668
	669	==== 1. Page Caching ====
	670	- Stores full HTML output
	671	- TTL-based expiration
	672	- Language and method-aware caching
	673	- Conditional request support (304 Not Modified)
	674
	675	==== 2. MIME Type Caching ====
	676	- Loads MIME types once and caches
	677	- Regenerates only when config changes
	678
	679	==== 3. Session Options ====
	680	- File-based sessions for simple deployments
	681	- Database sessions for distributed systems
	682
	683	==== 4. Compression ====
	684	- Manual gzip implementation
	685	- Proper Content-Length generation
	686	- Only compresses appropriate sizes
	687
	688	----
	689
	690	=== Debugging ===
686	691
687	692	The class integrates with WackoWiki's diagnostic system:
688	693
689		~~```~~php
	694	%%php
690	695	// Diagnostic messages are preserved across redirects
691	696	// via session flash data
692	697
693	698	// Check cached pages (debug comments in output):
694	699	// <!-- WackoWiki Caching Engine: page cached at 2024-01-15 12:30:45 GMT -->
695		```
696
697		---
698
699		## Related Classes
700
701		- Session Classes (`SessionFileStore`, `SessionDbalStore`) - Session management backends
702		- Database Class - Configuration and cache metadata storage
703		- Ut Utility Class - String/path utilities
704		- Diag Class - Diagnostic logging
705
706		---
707
708		## Version History
709
710		- Supports PHP 8.0+ (uses match expressions, union types)
711		- Follows RFC 9110 for HTTP header handling
712		- Modern cookie security practices
713
714		---
715
716		## Conclusion
717
718		The `Http` class is the central request/response handler in WackoWiki, managing everything from session initialization to security headers to file serving. Understanding this class is essential for:
719
720		- Extending WackoWiki with custom request handlers
721		- Implementing custom session logic
722		- Adding new security policies
723		- Optimizing cache strategies
724		- Debugging HTTP-related issues
	700	%%
	701
	702	----
	703
	704	=== Related Classes ===
	705	- Session Classes (##SessionFileStore##, ##SessionDbalStore##) - Session management backends
	706	- Database Class - Configuration and cache metadata storage
	707	- Ut Utility Class - String/path utilities
	708	- Diag Class - Diagnostic logging
	709
	710	----
	711
	712	=== Version History ===
	713	- Supports PHP 8.0+ (uses match expressions, union types)
	714	- Follows RFC 9110 for HTTP header handling
	715	- Modern cookie security practices
	716
	717	----
	718
	719	=== Conclusion ===
	720
	721	The ##Http## class is the central request/response handler in WackoWiki, managing everything from session initialization to security headers to file serving. Understanding this class is essential for:
	722	- Extending WackoWiki with custom request handlers
	723	- Implementing custom session logic
	724	- Adding new security policies
	725	- Optimizing cache strategies
	726	- Debugging HTTP-related issues