HttpHeader.h

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/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
#ifndef SQUID_HTTPHEADER_H
#define SQUID_HTTPHEADER_H
 
#include "anyp/ProtocolVersion.h"
#include "base/LookupTable.h"
#include "http/RegisteredHeaders.h"
/* because we pass a spec by value */
#include "HttpHeaderMask.h"
#include "mem/PoolingAllocator.h"
#include "sbuf/forward.h"
#include "SquidString.h"
 
#include <vector>
 
/* class forward declarations */
class HttpHdrCc;
class HttpHdrContRange;
class HttpHdrRange;
class HttpHdrSc;
class Packable;
 
typedef enum {
    hoNone =0,
#if USE_HTCP
    hoHtcpReply,
#endif
    hoRequest,
    hoReply,
#if USE_OPENSSL
    hoErrorDetail,
#endif
    hoEnd
} http_hdr_owner_type;
 
typedef ssize_t HttpHeaderPos;
 
/* use this and only this to initialize HttpHeaderPos */
#define HttpHeaderInitPos (-1)
 
class HttpHeaderEntry
{
    MEMPROXY_CLASS(HttpHeaderEntry);
 
public:
    HttpHeaderEntry(Http::HdrType id, const SBuf &name, const char *value);
    ~HttpHeaderEntry();
    static HttpHeaderEntry *parse(const char *field_start, const char *field_end, const http_hdr_owner_type msgType);
    HttpHeaderEntry *clone() const;
    void packInto(Packable *p) const;
    int getInt() const;
    int64_t getInt64() const;
 
    size_t length() const { return name.length() + 2 + value.size() + 2; }
 
    Http::HdrType id;
    SBuf name;
    String value;
};
 
class ETag;
class TimeOrTag;
 
class HttpHeader
{
 
public:
    explicit HttpHeader(const http_hdr_owner_type owner);
    HttpHeader(const HttpHeader &other);
    ~HttpHeader();
 
    HttpHeader &operator =(const HttpHeader &other);
 
    /* Interface functions */
    void clean();
    void append(const HttpHeader * src);
    void update(const HttpHeader *fresh);
    bool needUpdate(const HttpHeader *fresh) const;
    void compact();
    int parse(const char *header_start, size_t len, Http::ContentLengthInterpreter &interpreter);
    int parse(const char *buf, size_t buf_len, bool atEnd, size_t &hdr_sz, Http::ContentLengthInterpreter &interpreter);
    void packInto(Packable * p, bool mask_sensitive_info=false) const;
    HttpHeaderEntry *getEntry(HttpHeaderPos * pos) const;
    HttpHeaderEntry *findEntry(Http::HdrType id) const;
    int delByName(const SBuf &name);
    int delByName(const char *name) { return delByName(SBuf(name)); }
    int delById(Http::HdrType id);
    void delAt(HttpHeaderPos pos, int &headers_deleted);
    void refreshMask();
    void addEntry(HttpHeaderEntry * e);
    String getList(Http::HdrType id) const;
    bool getList(Http::HdrType id, String *s) const;
    bool conflictingContentLength() const { return conflictingContentLength_; }
    String getStrOrList(Http::HdrType id) const;
    String getByName(const SBuf &name) const;
    String getByName(const char *name) const;
    String getById(Http::HdrType id) const;
    bool getByIdIfPresent(Http::HdrType id, String *result) const;
    bool hasNamed(const SBuf &s, String *value = nullptr) const;
    bool hasNamed(const char *name, unsigned int namelen, String *value = nullptr) const;
    SBuf getByNameListMember(const char *name, const char *member, const char separator) const;
    SBuf getListMember(Http::HdrType id, const char *member, const char separator) const;
    int has(Http::HdrType id) const;
    void addVia(const AnyP::ProtocolVersion &ver, const HttpHeader *from = nullptr);
    void putInt(Http::HdrType id, int number);
    void putInt64(Http::HdrType id, int64_t number);
    void putTime(Http::HdrType id, time_t htime);
    void putStr(Http::HdrType id, const char *str);
    void putAuth(const char *auth_scheme, const char *realm);
    void putCc(const HttpHdrCc &cc);
    void putContRange(const HttpHdrContRange * cr);
    void putRange(const HttpHdrRange * range);
    void putSc(HttpHdrSc *sc);
    void putExt(const char *name, const char *value);
 
    void updateOrAddStr(Http::HdrType, const SBuf &);
 
    int getInt(Http::HdrType id) const;
    int64_t getInt64(Http::HdrType id) const;
    time_t getTime(Http::HdrType id) const;
    const char *getStr(Http::HdrType id) const;
    const char *getLastStr(Http::HdrType id) const;
    HttpHdrCc *getCc() const;
    HttpHdrRange *getRange() const;
    HttpHdrSc *getSc() const;
    HttpHdrContRange *getContRange() const;
    SBuf getAuthToken(Http::HdrType id, const char *auth_scheme) const;
    ETag getETag(Http::HdrType id) const;
    TimeOrTag getTimeOrTag(Http::HdrType id) const;
    int hasListMember(Http::HdrType id, const char *member, const char separator) const;
    int hasByNameListMember(const char *name, const char *member, const char separator) const;
    void removeHopByHopEntries();
 
    bool chunked() const { return has(Http::HdrType::TRANSFER_ENCODING); }
 
    bool unsupportedTe() const { return teUnsupported_; }
 
    /* protected, do not use these, use interface functions instead */
    std::vector<HttpHeaderEntry*, PoolingAllocator<HttpHeaderEntry*> > entries; 
    HttpHeaderMask mask;    
    http_hdr_owner_type owner;  
    int len;            
protected:
    void removeConnectionHeaderEntries();
    static bool Isolate(const char **parse_start, size_t l, const char **blk_start, const char **blk_end);
    bool skipUpdateHeader(const Http::HdrType id) const;
 
private:
    HttpHeaderEntry *findLastEntry(Http::HdrType id) const;
    bool conflictingContentLength_; 
    bool teUnsupported_ = false;
};
 
int httpHeaderParseQuotedString(const char *start, const int len, String *val);
 
namespace Http {
 
SBuf SlowlyParseQuotedString(const char *description, const char *start, size_t length);
 
}
 
SBuf httpHeaderQuoteString(const char *raw);
 
void httpHeaderCalcMask(HttpHeaderMask * mask, Http::HdrType http_hdr_type_enums[], size_t count);
 
void httpHeaderInitModule(void);
 
#endif /* SQUID_HTTPHEADER_H */