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libreoffice-online/common/Util.hpp
Ashod Nakashian 77e7cae689 wsd: fix password-protect file loading from multiple views 
With password-protected files, the first loading attempt
always fails due to missing password. At that point the
client is notified of the missing password and the user
is prompted. The second attempt includes a (hopefully)
correct password and the document loading commences.

Due to the fact that an exception is raised when
the loading fails, this left the loading latch
triggered, which blocked subsequent attempts.

Change-Id: I7cc257a36eb1cc080f460aac8cdb7030783a5914
2019-10-14 21:35:27 +01:00

964 lines
28 KiB
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_UTIL_HPP
#define INCLUDED_UTIL_HPP
#include <cassert>
#include <cerrno>
#include <cinttypes>
#include <cstddef>
#include <cstring>
#include <atomic>
#include <functional>
#include <memory>
#include <mutex>
#include <set>
#include <sstream>
#include <string>
#include <inttypes.h>
#include <memory.h>
#ifndef __linux
#include <thread>
#endif
#include <Poco/File.h>
#include <Poco/Path.h>
#include <Poco/Process.h>
#include <Poco/RegularExpression.h>
#define LOK_USE_UNSTABLE_API
#include <LibreOfficeKit/LibreOfficeKitEnums.h>
namespace Util
{
namespace rng
{
void reseed();
unsigned getNext();
/// Generate an array of random characters.
std::vector<char> getBytes(const size_t length);
/// Generate a string of random characters.
std::string getHexString(const size_t length);
/// Generate a hard random string of characters.
std::string getHardRandomHexString(const size_t length);
/// Generates a random string suitable for
/// file/directory names.
std::string getFilename(const size_t length);
}
/// Create randomized temporary directory
std::string createRandomTmpDir();
#if !MOBILEAPP
/// Get number of threads in this process or -1 on error
int getProcessThreadCount();
/// Spawn a process if stdInput is non-NULL it contains a writable descriptor
/// to send data to the child.
int spawnProcess(const std::string &cmd, const std::vector<std::string> &args,
int *stdInput = nullptr);
#endif
/// Hex to unsigned char
bool dataFromHexString(const std::string& hexString, std::vector<unsigned char>& data);
/// Encode an integral ID into a string, with padding support.
std::string encodeId(const std::uint64_t number, const int padding = 5);
/// Decode an integral ID from a string.
std::uint64_t decodeId(const std::string& str);
bool windowingAvailable();
#if !defined(BUILDING_TESTS) && !defined(KIT_IN_PROCESS) && !MOBILEAPP
/// Send a message to all clients.
void alertAllUsers(const std::string& msg);
/// Send a 'error:' message with the specified cmd and kind parameters to all connected
/// clients. This function can be called either in loolwsd or loolkit processes, even if only
/// loolwsd obviously has contact with the actual clients; in loolkit it will be forwarded to
/// loolwsd for redistribution. (This function must be implemented separately in each program
/// that uses it, it is not in Util.cpp.)
void alertAllUsers(const std::string& cmd, const std::string& kind);
#else
/// No-op implementation in the test programs
inline void alertAllUsers(const std::string&)
{
}
/// No-op implementation in the test programs
inline void alertAllUsers(const std::string&, const std::string&)
{
}
#endif
/// Assert that a lock is already taken.
template <typename T>
void assertIsLocked(const T& lock)
{
#ifdef NDEBUG
(void) lock;
#else
assert(lock.owns_lock());
#endif
}
inline void assertIsLocked(std::mutex& mtx)
{
#ifdef NDEBUG
(void) mtx;
#else
assert(!mtx.try_lock());
#endif
}
#if !MOBILEAPP
/// Print given number of bytes in human-understandable form (KB,MB, etc.)
std::string getHumanizedBytes(unsigned long nBytes);
/// Returns the total physical memory (in kB) available in the system
size_t getTotalSystemMemoryKb();
/// Returns the process PSS in KB (works only when we have perms for /proc/pid/smaps).
size_t getMemoryUsagePSS(const Poco::Process::PID pid);
/// Returns the process RSS in KB.
size_t getMemoryUsageRSS(const Poco::Process::PID pid);
/// Returns the RSS and PSS of the current process in KB.
/// Example: "procmemstats: pid=123 rss=12400 pss=566"
std::string getMemoryStats(FILE* file);
size_t getCpuUsage(const Poco::Process::PID pid);
size_t getStatFromPid(const Poco::Process::PID pid, int ind);
#endif
std::string replace(std::string s, const std::string& a, const std::string& b);
std::string formatLinesForLog(const std::string& s);
void setThreadName(const std::string& s);
const char *getThreadName();
#ifdef __linux
pid_t getThreadId();
#else
std::thread::id getThreadId();
#endif
/// Get version information
void getVersionInfo(std::string& version, std::string& hash);
/// Return a string that is unique across processes and calls.
std::string UniqueId();
// Extract all json entries into a map.
std::map<std::string, std::string> JsonToMap(const std::string& jsonString);
inline int hexDigitFromChar(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
else
return -1;
}
/// Dump a lineof data as hex
inline std::string stringifyHexLine(
const std::vector<char> &buffer,
unsigned int offset,
const unsigned int width = 32)
{
char scratch[64];
std::stringstream os;
for (unsigned int i = 0; i < width; i++)
{
if (i && (i % 8) == 0)
os << " ";
if ((offset + i) < buffer.size())
sprintf (scratch, "%.2x ", (unsigned char)buffer[offset+i]);
else
sprintf (scratch, " ");
os << scratch;
}
os << " | ";
for (unsigned int i = 0; i < width; i++)
{
if ((offset + i) < buffer.size() && ::isprint(buffer[offset+i]))
sprintf (scratch, "%c", buffer[offset+i]);
else
sprintf (scratch, ".");
os << scratch;
}
return os.str();
}
/// Dump data as hex and chars to stream
inline void dumpHex (std::ostream &os, const char *legend, const char *prefix,
const std::vector<char> &buffer, bool skipDup = true,
const unsigned int width = 32)
{
unsigned int j;
char scratch[64];
int skip = 0;
std::string lastLine;
os << legend;
for (j = 0; j < buffer.size() + width - 1; j += width)
{
sprintf (scratch, "%s0x%.4x ", prefix, j);
os << scratch;
std::string line = stringifyHexLine(buffer, j, width);
if (skipDup && lastLine == line)
skip++;
else {
if (skip > 0)
{
os << "... dup " << skip - 1 << "...";
skip = 0;
}
else
os << line;
}
lastLine.swap(line);
os << "\n";
}
os.flush();
}
inline void dumpHex (std::ostream &os, const char *legend, const char *prefix,
const std::string &str, bool skipDup = true,
const unsigned int width = 32)
{
std::vector<char> buffer(str.begin(), str.end());
dumpHex(os, legend, prefix, buffer, skipDup, width);
}
inline std::string dumpHex (const char *legend, const char *prefix,
const std::vector<char>::iterator &startIt,
const std::vector<char>::iterator &endIt,
bool skipDup = true, const unsigned int width = 32)
{
std::ostringstream oss;
std::vector<char> data(startIt, endIt);
dumpHex(oss, legend, prefix, data, skipDup, width);
return oss.str();
}
size_t findInVector(const std::vector<char>& tokens, const char *cstring);
/// Trim spaces from the left. Just spaces.
inline std::string& ltrim(std::string& s)
{
const size_t pos = s.find_first_not_of(' ');
if (pos != std::string::npos)
{
s = s.substr(pos);
}
return s;
}
/// Trim spaces from the left and copy. Just spaces.
inline std::string ltrimmed(const std::string& s)
{
const size_t pos = s.find_first_not_of(' ');
if (pos != std::string::npos)
{
return s.substr(pos);
}
return s;
}
/// Trim spaces from both left and right. Just spaces.
inline std::string& trim(std::string& s)
{
const size_t first = s.find_first_not_of(' ');
const size_t last = s.find_last_not_of(' ');
if (first != std::string::npos)
{
if (last != std::string::npos)
{
s = s.substr(first, last + 1 - first);
}
else
{
s = s.substr(first);
}
}
else
{
if (last != std::string::npos)
{
s = s.substr(0, last + 1);
}
else
{
s.clear();
}
}
return s;
}
/// Trim spaces from both left and right and copy. Just spaces.
inline std::string trimmed(const std::string& s)
{
const size_t first = s.find_first_not_of(' ');
const size_t last = s.find_last_not_of(' ');
if (first != std::string::npos)
{
if (last != std::string::npos)
{
return s.substr(first, last + 1 - first);
}
return s.substr(first);
}
if (last != std::string::npos)
{
return s.substr(0, last + 1);
}
return std::string();
}
/// Trim spaces from left and right. Just spaces.
inline std::string trimmed(const char* s)
{
return trimmed(std::string(s));
}
/// Return true iff s starts with t.
inline bool startsWith(const std::string& s, const std::string& t)
{
return s.length() >= t.length() && memcmp(s.c_str(), t.c_str(), t.length()) == 0;
}
/// Return true iff s starts with t.
inline bool startsWith(const std::string& s, const char* t)
{
if (t != nullptr && !s.empty())
{
const size_t len = std::strlen(t);
return s.length() >= len && memcmp(s.c_str(), t, len) == 0;
}
return false;
}
#ifdef IOS
inline void *memrchr(const void *s, int c, size_t n)
{
char *p = (char*)s + n - 1;
while (p >= (char*)s)
{
if (*p == c)
return p;
p--;
}
return nullptr;
}
#if 0
// Unit test for the above memrchr()
int main(int argc, char**argv)
{
int success = 1;
char *s;
char *p;
#define TEST(s_,c,n,e) \
s = s_; \
printf("memrchr(\"%s\",'%c',%d)=",s,c,n); \
p = memrchr(s, c, n); \
if (p) \
printf("\"%s\"", p); \
else \
printf("NULL"); \
if (p == e) \
printf(" OK\n"); \
else \
{ \
printf(" FAIL\n"); \
success = 0; \
}
TEST("abc", 'x', 0, NULL);
TEST("abc", 'x', 1, NULL);
TEST("abc", 'x', 3, NULL);
TEST("abc", 'a', 0, NULL);
TEST("abc", 'a', 1, s);
TEST("abc", 'a', 3, s);
TEST("abc", 'b', 0, NULL);
TEST("abc", 'b', 1, NULL);
TEST("abc", 'b', 2, s+1);
TEST("abc", 'b', 3, s+1);
TEST("abc", 'c', 0, NULL);
TEST("abc", 'c', 1, NULL);
TEST("abc", 'c', 2, NULL);
TEST("abc", 'c', 3, s+2);
if (success)
return 0;
else
return 1;
}
#endif
#endif
inline size_t getLastDelimiterPosition(const char* message, const int length, const char delim)
{
if (message && length > 0)
{
const char *founddelim = static_cast<const char *>(memrchr(message, delim, length));
const auto size = (founddelim == nullptr ? length : founddelim - message);
return size;
}
return 0;
}
/// Return the symbolic name for an errno value, or in decimal if not handled here.
inline std::string symbolicErrno(int e)
{
// Errnos from <asm-generic/errno-base.h> and <asm-generic/errno.h> on Linux.
switch (e)
{
case EPERM: return "EPERM";
case ENOENT: return "ENOENT";
case ESRCH: return "ESRCH";
case EINTR: return "EINTR";
case EIO: return "EIO";
case ENXIO: return "ENXIO";
case E2BIG: return "E2BIG";
case ENOEXEC: return "ENOEXEC";
case EBADF: return "EBADF";
case ECHILD: return "ECHILD";
case EAGAIN: return "EAGAIN";
case ENOMEM: return "ENOMEM";
case EACCES: return "EACCES";
case EFAULT: return "EFAULT";
case ENOTBLK: return "ENOTBLK";
case EBUSY: return "EBUSY";
case EEXIST: return "EEXIST";
case EXDEV: return "EXDEV";
case ENODEV: return "ENODEV";
case ENOTDIR: return "ENOTDIR";
case EISDIR: return "EISDIR";
case EINVAL: return "EINVAL";
case ENFILE: return "ENFILE";
case EMFILE: return "EMFILE";
case ENOTTY: return "ENOTTY";
case ETXTBSY: return "ETXTBSY";
case EFBIG: return "EFBIG";
case ENOSPC: return "ENOSPC";
case ESPIPE: return "ESPIPE";
case EROFS: return "EROFS";
case EMLINK: return "EMLINK";
case EPIPE: return "EPIPE";
case EDOM: return "EDOM";
case ERANGE: return "ERANGE";
case EDEADLK: return "EDEADLK";
case ENAMETOOLONG: return "ENAMETOOLONG";
case ENOLCK: return "ENOLCK";
case ENOSYS: return "ENOSYS";
case ENOTEMPTY: return "ENOTEMPTY";
case ELOOP: return "ELOOP";
case ENOMSG: return "ENOMSG";
case EIDRM: return "EIDRM";
#ifdef ECHRNG
case ECHRNG: return "ECHRNG";
#endif
#ifdef EL2NSYNC
case EL2NSYNC: return "EL2NSYNC";
#endif
#ifdef EL3HLT
case EL3HLT: return "EL3HLT";
#endif
#ifdef EL3RST
case EL3RST: return "EL3RST";
#endif
#ifdef ELNRNG
case ELNRNG: return "ELNRNG";
#endif
#ifdef EUNATCH
case EUNATCH: return "EUNATCH";
#endif
#ifdef ENOCSI
case ENOCSI: return "ENOCSI";
#endif
#ifdef EL2HLT
case EL2HLT: return "EL2HLT";
#endif
#ifdef EBADE
case EBADE: return "EBADE";
#endif
#ifdef EBADR
case EBADR: return "EBADR";
#endif
#ifdef EXFULL
case EXFULL: return "EXFULL";
#endif
#ifdef ENOANO
case ENOANO: return "ENOANO";
#endif
#ifdef EBADRQC
case EBADRQC: return "EBADRQC";
#endif
#ifdef EBADSLT
case EBADSLT: return "EBADSLT";
#endif
#ifdef EBFONT
case EBFONT: return "EBFONT";
#endif
case ENOSTR: return "ENOSTR";
case ENODATA: return "ENODATA";
case ETIME: return "ETIME";
case ENOSR: return "ENOSR";
#ifdef ENONET
case ENONET: return "ENONET";
#endif
#ifdef ENOPKG
case ENOPKG: return "ENOPKG";
#endif
case EREMOTE: return "EREMOTE";
case ENOLINK: return "ENOLINK";
#ifdef EADV
case EADV: return "EADV";
#endif
#ifdef ESRMNT
case ESRMNT: return "ESRMNT";
#endif
#ifdef ECOMM
case ECOMM: return "ECOMM";
#endif
case EPROTO: return "EPROTO";
case EMULTIHOP: return "EMULTIHOP";
#ifdef EDOTDOT
case EDOTDOT: return "EDOTDOT";
#endif
case EBADMSG: return "EBADMSG";
case EOVERFLOW: return "EOVERFLOW";
#ifdef ENOTUNIQ
case ENOTUNIQ: return "ENOTUNIQ";
#endif
#ifdef EBADFD
case EBADFD: return "EBADFD";
#endif
#ifdef EREMCHG
case EREMCHG: return "EREMCHG";
#endif
#ifdef ELIBACC
case ELIBACC: return "ELIBACC";
#endif
#ifdef ELIBBAD
case ELIBBAD: return "ELIBBAD";
#endif
#ifdef ELIBSCN
case ELIBSCN: return "ELIBSCN";
#endif
#ifdef ELIBMAX
case ELIBMAX: return "ELIBMAX";
#endif
#ifdef ELIBEXEC
case ELIBEXEC: return "ELIBEXEC";
#endif
case EILSEQ: return "EILSEQ";
#ifdef ERESTART
case ERESTART: return "ERESTART";
#endif
#ifdef ESTRPIPE
case ESTRPIPE: return "ESTRPIPE";
#endif
case EUSERS: return "EUSERS";
case ENOTSOCK: return "ENOTSOCK";
case EDESTADDRREQ: return "EDESTADDRREQ";
case EMSGSIZE: return "EMSGSIZE";
case EPROTOTYPE: return "EPROTOTYPE";
case ENOPROTOOPT: return "ENOPROTOOPT";
case EPROTONOSUPPORT: return "EPROTONOSUPPORT";
case ESOCKTNOSUPPORT: return "ESOCKTNOSUPPORT";
case EOPNOTSUPP: return "EOPNOTSUPP";
case EPFNOSUPPORT: return "EPFNOSUPPORT";
case EAFNOSUPPORT: return "EAFNOSUPPORT";
case EADDRINUSE: return "EADDRINUSE";
case EADDRNOTAVAIL: return "EADDRNOTAVAIL";
case ENETDOWN: return "ENETDOWN";
case ENETUNREACH: return "ENETUNREACH";
case ENETRESET: return "ENETRESET";
case ECONNABORTED: return "ECONNABORTED";
case ECONNRESET: return "ECONNRESET";
case ENOBUFS: return "ENOBUFS";
case EISCONN: return "EISCONN";
case ENOTCONN: return "ENOTCONN";
case ESHUTDOWN: return "ESHUTDOWN";
case ETOOMANYREFS: return "ETOOMANYREFS";
case ETIMEDOUT: return "ETIMEDOUT";
case ECONNREFUSED: return "ECONNREFUSED";
case EHOSTDOWN: return "EHOSTDOWN";
case EHOSTUNREACH: return "EHOSTUNREACH";
case EALREADY: return "EALREADY";
case EINPROGRESS: return "EINPROGRESS";
case ESTALE: return "ESTALE";
#ifdef EUCLEAN
case EUCLEAN: return "EUCLEAN";
#endif
#ifdef ENOTNAM
case ENOTNAM: return "ENOTNAM";
#endif
#ifdef ENAVAIL
case ENAVAIL: return "ENAVAIL";
#endif
#ifdef EISNAM
case EISNAM: return "EISNAM";
#endif
#ifdef EREMOTEIO
case EREMOTEIO: return "EREMOTEIO";
#endif
case EDQUOT: return "EDQUOT";
#ifdef ENOMEDIUM
case ENOMEDIUM: return "ENOMEDIUM";
#endif
#ifdef EMEDIUMTYPE
case EMEDIUMTYPE: return "EMEDIUMTYPE";
#endif
case ECANCELED: return "ECANCELED";
#ifdef ENOKEY
case ENOKEY: return "ENOKEY";
#endif
#ifdef EKEYEXPIRED
case EKEYEXPIRED: return "EKEYEXPIRED";
#endif
#ifdef EKEYREVOKED
case EKEYREVOKED: return "EKEYREVOKED";
#endif
#ifdef EKEYREJECTED
case EKEYREJECTED: return "EKEYREJECTED";
#endif
case EOWNERDEAD: return "EOWNERDEAD";
case ENOTRECOVERABLE: return "ENOTRECOVERABLE";
#ifdef ERFKILL
case ERFKILL: return "ERFKILL";
#endif
#ifdef EHWPOISON
case EHWPOISON: return "EHWPOISON";
#endif
default: return std::to_string(e);
}
}
inline size_t getDelimiterPosition(const char* message, const int length, const char delim)
{
if (message && length > 0)
{
const char *founddelim = static_cast<const char *>(std::memchr(message, delim, length));
const size_t size = (founddelim == nullptr ? length : founddelim - message);
return size;
}
return 0;
}
inline
std::string getDelimitedInitialSubstring(const char *message, const int length, const char delim)
{
const size_t size = getDelimiterPosition(message, length, delim);
return std::string(message, size);
}
/// Split a string in two at the delimiter, removing it.
inline
std::pair<std::string, std::string> split(const char* s, const int length, const char delimiter = ' ', bool removeDelim = true)
{
const size_t size = getDelimiterPosition(s, length, delimiter);
std::string after;
int after_pos = size + (removeDelim? 1: 0);
if (after_pos < length)
after = std::string(s + after_pos, length - after_pos);
return std::make_pair(std::string(s, size), after);
}
/// Split a string in two at the delimiter, removing it.
inline
std::pair<std::string, std::string> split(const std::string& s, const char delimiter = ' ', bool removeDelim = true)
{
return split(s.c_str(), s.size(), delimiter, removeDelim);
}
/// Split a string in two at the delimiter.
inline
std::pair<std::string, std::string> splitLast(const char* s, const int length, const char delimiter = ' ', bool removeDelim = true)
{
const size_t size = getLastDelimiterPosition(s, length, delimiter);
std::string after;
int after_pos = size + (removeDelim? 1: 0);
if (after_pos < length)
after = std::string(s + after_pos, length - after_pos);
return std::make_pair(std::string(s, size), after);
}
/// Split a string in two at the delimiter, removing it.
inline
std::pair<std::string, std::string> splitLast(const std::string& s, const char delimiter = ' ', bool removeDelim = true)
{
return splitLast(s.c_str(), s.size(), delimiter, removeDelim);
}
/// Append a length bytes to a vector, or strlen of data as a C string if not provided
/// returns count of bytes appended.
inline void vectorAppend(std::vector<char> &vector, const char *data, ssize_t length = -1)
{
size_t vlen = vector.size();
if (!data)
{
return;
}
size_t dataLen = length;
if (length < 0)
dataLen = strlen(data);
vector.resize(vlen+dataLen);
std::memcpy(vector.data() + vlen, data, dataLen);
}
/// Append a number as hexadecimal to a vector
inline void vectorAppendHex(std::vector<char> &vector, uint64_t number)
{
char output[32];
sprintf(output, "%" PRIx64, number);
vectorAppend(vector, output);
}
/// Splits a URL into path (with protocol), filename, extension, parameters.
/// All components are optional, depending on what the URL represents (can be a unix path).
std::tuple<std::string, std::string, std::string, std::string> splitUrl(const std::string& url);
/// Check for the URI scheme validity.
/// For now just a basic sanity check, can be extended if necessary.
bool isValidURIScheme(const std::string& scheme);
/// Check for the URI host validity.
/// For now just a basic sanity check, can be extended if necessary.
bool isValidURIHost(const std::string& host);
/// Anonymize a sensitive string to avoid leaking it.
/// Called on strings to be logged or exposed.
std::string anonymize(const std::string& text, const std::uint64_t nAnonymizationSalt);
/// Sets the anonymized version of a given plain-text string.
/// After this, 'anonymize(plain)' will return 'anonymized'.
void mapAnonymized(const std::string& plain, const std::string& anonymized);
/// Anonymize the basename of filenames only, preserving the path and extension.
std::string anonymizeUrl(const std::string& url, const std::uint64_t nAnonymizationSalt);
/// Extract and return the filename given a url or path.
std::string getFilenameFromURL(const std::string& url);
/// Given one or more patterns to allow, and one or more to deny,
/// the match member will return true if, and only if, the subject
/// matches the allowed list, but not the deny.
/// By default, everything is denied.
class RegexListMatcher
{
public:
RegexListMatcher() :
_allowByDefault(false)
{
}
RegexListMatcher(const bool allowByDefault) :
_allowByDefault(allowByDefault)
{
}
RegexListMatcher(std::initializer_list<std::string> allowed) :
_allowByDefault(false),
_allowed(allowed)
{
}
RegexListMatcher(std::initializer_list<std::string> allowed,
std::initializer_list<std::string> denied) :
_allowByDefault(false),
_allowed(allowed),
_denied(denied)
{
}
RegexListMatcher(const bool allowByDefault,
std::initializer_list<std::string> denied) :
_allowByDefault(allowByDefault),
_denied(denied)
{
}
void allow(const std::string& pattern) { _allowed.insert(pattern); }
void deny(const std::string& pattern)
{
_allowed.erase(pattern);
_denied.insert(pattern);
}
void clear()
{
_allowed.clear();
_denied.clear();
}
bool match(const std::string& subject) const
{
return (_allowByDefault || match(_allowed, subject)) && !match(_denied, subject);
}
private:
static bool match(const std::set<std::string>& set, const std::string& subject)
{
if (set.find(subject) != set.end())
{
return true;
}
// Not a perfect match, try regex.
for (const auto& value : set)
{
try
{
// Not performance critical to warrant caching.
Poco::RegularExpression re(value, Poco::RegularExpression::RE_CASELESS);
Poco::RegularExpression::Match reMatch;
// Must be a full match.
if (re.match(subject, reMatch) && reMatch.offset == 0 && reMatch.length == subject.size())
{
return true;
}
}
catch (const std::exception& exc)
{
// Nothing to do; skip.
}
}
return false;
}
private:
const bool _allowByDefault;
std::set<std::string> _allowed;
std::set<std::string> _denied;
};
/// A logical constant that is allowed to initialize
/// exactly once and checks usage before initialization.
template <typename T>
class RuntimeConstant
{
T _value;
std::atomic<bool> _initialized;
public:
RuntimeConstant()
: _value()
, _initialized(false)
{
}
/// Use a compile-time const instead.
RuntimeConstant(const T& value) = delete;
const T& get()
{
if (_initialized)
{
return _value;
}
throw std::runtime_error("RuntimeConstant instance read before being initialized.");
}
void set(const T& value)
{
assert(!_initialized);
_initialized = true;
_value = value;
}
};
//// Return current time in HTTP format.
std::string getHttpTimeNow();
//// Return time in HTTP format.
std::string getHttpTime(std::chrono::system_clock::time_point time);
//// Return timestamp of file
std::chrono::system_clock::time_point getFileTimestamp(std::string str_path);
//// Return time in ISO8061 fraction format
std::string getIso8601FracformatTime(std::chrono::system_clock::time_point time);
//// Convert time from ISO8061 fraction format
std::chrono::system_clock::time_point iso8601ToTimestamp(const std::string& iso8601Time, const std::string& logName);
/// Automatically execute code at end of current scope.
/// Used for exception-safe code.
class ScopeGuard
{
public:
template <typename T>
explicit ScopeGuard(T const &func) : m_func(func) {}
~ScopeGuard()
{
if (m_func)
m_func();
}
private:
ScopeGuard(const ScopeGuard &) = delete;
ScopeGuard &operator=(const ScopeGuard &) = delete;
std::function<void()> m_func;
};
} // end namespace Util
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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