netcdf-c/include/ncuri.h
Dennis Heimbigner 49737888ca Improve S3 Documentation and Support
## Improvements to S3 Documentation
* Create a new document *quickstart_paths.md* that give a summary of the legal path formats used by netcdf-c. This includes both file paths and URL paths.
* Modify *nczarr.md* to remove most of the S3 related text.
* Move the S3 text from *nczarr.md* to a new document *cloud.md*.
* Add some S3-related text to the *byterange.md* document.

Hopefully, this will make it easier for users to find the information they want.

## Rebuild NCZarr Testing
In order to avoid problems with running make check in parallel, two changes were made:
1. The *nczarr_test* test system was rebuilt. Now, for each test.
any generated files are kept in a test-specific directory, isolated
from all other test executions.
2. Similarly, since the S3 test bucket is shared, any generated S3 objects
are isolated using a test-specific key path.

## Other S3 Related Changes
* Add code to ensure that files created on S3 are reclaimed at end of testing.
* Used the bash "trap" command to ensure S3 cleanup even if the test fails.
* Cleanup the S3 related configure.ac flag set since S3 is used in several places. So now one should use the option *--enable-s3* instead of *--enable-nczarr-s3*, although the latter is still kept as a deprecated alias for the former.
* Get some of the github actions yml to work with S3; required fixing various test scripts adding a secret to access the Unidata S3 bucket.
* Cleanup S3 portion of libnetcdf.settings.in and netcdf_meta.h.in and test_common.in.
* Merge partial S3 support into dhttp.c.
* Create an experimental s3 access library especially for use with Windows. It is enabled by using the options *--enable-s3-internal* (automake) or *-DENABLE_S3_INTERNAL=ON* (CMake). Also add a unit-test for it.
* Move some definitions from ncrc.h to ncs3sdk.h

## Other Changes
* Provide a default implementation of strlcpy and move this and similar defaults into *dmissing.c*.
2023-04-25 17:15:06 -06:00

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C

/*
* Copyright 2018, University Corporation for Atmospheric Research
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*/
#ifndef NCURI_H
#define NCURI_H
#include "ncexternl.h"
/* Define flags to control what is included by ncuribuild;
protocol+host+port always included
*/
#define NCURIPATH 1
#define NCURIPWD 2
#define NCURIQUERY 4
#define NCURIFRAG 8
#define NCURIENCODEPATH 16 /* If output url path should be encoded */
#define NCURIENCODEQUERY 32 /* If output url query should be encoded */
#define NCURIENCODE (NCURIENCODEPATH|NCURIENCODEQUERY)
#define NCURIBASE (NCURIPWD|NCURIPATH)
#define NCURISVC (NCURIBASE|NCURIQUERY) /* for sending to server */
#define NCURIALL (NCURIBASE|NCURIQUERY|NCURIFRAG) /* for rebuilding after changes */
/*! This is an open structure meaning
it is ok to directly access its fields
*/
typedef struct NCURI {
char* uri; /* copy of url as passed by the caller */
char* protocol;
char* user; /* from user:password@ */
char* password; /* from user:password@ */
char* host; /*!< host*/
char* port; /*!< port */
char* path; /*!< path */
char* query; /*!< query */
char* fragment; /*!< fragment */
char** fraglist; /* envv style list of decomposed fragment*/
char** querylist; /* envv style list of decomposed query*/
#if 0
char* projection; /*!< without leading '?'*/
char* selection; /*!< with leading '&'*/
#endif
} NCURI;
#if 0
/* Declaration modifiers for DLL support (MSC et al) */
#if defined(DLL_NETCDF) /* define when library is a DLL */
# if defined(DLL_EXPORT) /* define when building the library */
# define MSC_EXTRA __declspec(dllexport)
# else
# define MSC_EXTRA __declspec(dllimport)
# endif
# include <io.h>
#else
#define MSC_EXTRA /**< Needed for DLL build. */
#endif /* defined(DLL_NETCDF) */
#define EXTERNL MSC_EXTRA extern /**< Needed for DLL build. */
#endif
#if defined(_CPLUSPLUS_) || defined(__CPLUSPLUS__) || defined(__CPLUSPLUS)
extern "C" {
#endif
EXTERNL int ncuriparse(const char* s, NCURI** ncuri);
EXTERNL void ncurifree(NCURI* ncuri);
/* Replace the protocol */
EXTERNL int ncurisetprotocol(NCURI*,const char* newprotocol);
/* Replace the host */
EXTERNL int ncurisethost(NCURI*,const char* newhost);
/* Replace the path */
EXTERNL int ncurisetpath(NCURI*,const char* newpath);
/* Replace the constraints */
EXTERNL int ncurisetquery(NCURI*,const char* query);
/* Replace the fragment list */
EXTERNL int ncurisetfragments(NCURI*, const char* fragments);
/* Rebuild the uri */
EXTERNL int ncurirebuild(NCURI*);
/* Replace a specific &key=...& in uri fragment */
EXTERNL int ncurisetfragmentkey(NCURI* duri,const char* key, const char* value);
/* append a specific &key=...& in uri fragment */
EXTERNL int ncuriappendfragmentkey(NCURI* duri,const char* key, const char* value);
/* Construct a complete NC URI; caller frees returned string */
EXTERNL char* ncuribuild(NCURI*,const char* prefix, const char* suffix, int flags);
/*! Search the fragment for a given parameter
Null result => entry not found; !NULL=>found;
In any case, the result is imutable and should not be free'd.
*/
EXTERNL const char* ncurifragmentlookup(NCURI*, const char* param);
/*! Search the query for a given parameter
Null result => entry not found; !NULL=>found;
In any case, the result is imutable and should not be free'd.
*/
EXTERNL const char* ncuriquerylookup(NCURI*, const char* param);
/* Obtain the complete list of fragment pairs in envv format */
EXTERNL const char** ncurifragmentparams(NCURI*);
/* Obtain the complete list of query pairs in envv format */
EXTERNL const char** ncuriqueryparams(NCURI*);
/* URL Encode/Decode */
EXTERNL char* ncuridecode(const char* s);
/* Partial decode */
EXTERNL char* ncuridecodepartial(const char* s, const char* decodeset);
/* Encode using specified character set */
EXTERNL char* ncuriencodeonly(const char* s, const char* allowable);
/* Encode user or pwd */
EXTERNL char* ncuriencodeuserpwd(const char* s);
/* Deep clone a uri */
EXTERNL NCURI* ncuriclone(NCURI*);
#if defined(_CPLUSPLUS_) || defined(__CPLUSPLUS__) || defined(__CPLUSPLUS)
}
#endif
#endif /*NCURI_H*/