plugin_reclaim_credential_jwt.c File Reference

reclaim-credential-plugin-jwt attribute plugin to provide the API for JWT credentials. More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_reclaim_plugin.h"
#include <inttypes.h>
#include <jansson.h>

Include dependency graph for plugin_reclaim_credential_jwt.c:

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Functions
static char *	jwt_value_to_string (void *cls, uint32_t type, const void *data, size_t data_size)
	Convert the 'value' of an credential to a string. More...
static int	jwt_string_to_value (void *cls, uint32_t type, const char *s, void **data, size_t *data_size)
	Convert human-readable version of a 'value' of an credential to the binary representation. More...
static uint32_t	jwt_typename_to_number (void *cls, const char *jwt_typename)
	Convert a type name to the corresponding number. More...
static const char *	jwt_number_to_typename (void *cls, uint32_t type)
	Convert a type number to the corresponding type string (e.g. More...
static struct GNUNET_RECLAIM_AttributeList *	jwt_parse_attributes (void *cls, const char *data, size_t data_size)
	Parse a JWT and return the respective claim value as Attribute. More...
static struct GNUNET_RECLAIM_AttributeList *	jwt_parse_attributes_c (void *cls, const struct GNUNET_RECLAIM_Credential *cred)
	Parse a JWT and return the respective claim value as Attribute. More...
static struct GNUNET_RECLAIM_AttributeList *	jwt_parse_attributes_p (void *cls, const struct GNUNET_RECLAIM_Presentation *cred)
	Parse a JWT and return the respective claim value as Attribute. More...
static char *	jwt_get_issuer (void *cls, const char *data, size_t data_size)
	Parse a JWT and return the issuer. More...
static char *	jwt_get_issuer_c (void *cls, const struct GNUNET_RECLAIM_Credential *cred)
	Parse a JWT and return the issuer. More...
static char *	jwt_get_issuer_p (void *cls, const struct GNUNET_RECLAIM_Presentation *cred)
	Parse a JWT and return the issuer. More...
static enum GNUNET_GenericReturnValue	jwt_get_expiration (void *cls, const char *data, size_t data_size, struct GNUNET_TIME_Absolute *exp)
	Parse a JWT and return the expiration. More...
static enum GNUNET_GenericReturnValue	jwt_get_expiration_c (void *cls, const struct GNUNET_RECLAIM_Credential *cred, struct GNUNET_TIME_Absolute *exp)
	Parse a JWT and return the expiration. More...
static enum GNUNET_GenericReturnValue	jwt_get_expiration_p (void *cls, const struct GNUNET_RECLAIM_Presentation *cred, struct GNUNET_TIME_Absolute *exp)
	Parse a JWT and return the expiration. More...
static enum GNUNET_GenericReturnValue	jwt_create_presentation (void *cls, const struct GNUNET_RECLAIM_Credential *cred, const struct GNUNET_RECLAIM_AttributeList *attrs, struct GNUNET_RECLAIM_Presentation **presentation)
void *	libgnunet_plugin_reclaim_credential_jwt_init (void *cls)
	Entry point for the plugin. More...
void *	libgnunet_plugin_reclaim_credential_jwt_done (void *cls)
	Exit point from the plugin. More...

Variables
struct {
const char *   name
uint32_t   number
}	jwt_cred_name_map []
	Mapping of credential type numbers to human-readable credential type names. More...

Detailed Description

reclaim-credential-plugin-jwt attribute plugin to provide the API for JWT credentials.

Author

Martin Schanzenbach

Definition in file plugin_reclaim_credential_jwt.c.

Function Documentation

jwt_value_to_string()

static char * jwt_value_to_string ( void *  cls, uint32_t  type, const void *  data, size_t  data_size  )

static

Convert the 'value' of an credential to a string.

Parameters

cls	closure, unused
type	type of the credential
data	value in binary encoding
data_size	number of bytes in data

Returns

NULL on error, otherwise human-readable representation of the value

Definition at line 44 of file plugin_reclaim_credential_jwt.c.

{
  switch (type)
  {
  case GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT:
    return GNUNET_strndup (data, data_size);
 
  default:
    return NULL;
  }
}

References data, data_size, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, GNUNET_strndup, and type.

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_string_to_value()

static int jwt_string_to_value ( void *  cls, uint32_t  type, const char *  s, void **  data, size_t *  data_size  )

static

Convert human-readable version of a 'value' of an credential to the binary representation.

Parameters

cls	closure, unused
type	type of the credential
s	human-readable string
data	set to value in binary encoding (will be allocated)
data_size	set to number of bytes in data

Returns

GNUNET_OK on success

Definition at line 72 of file plugin_reclaim_credential_jwt.c.

{
  if (NULL == s)
    return GNUNET_SYSERR;
  switch (type)
  {
  case GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT:
    *data = GNUNET_strdup (s);
    *data_size = strlen (s) + 1;
    return GNUNET_OK;
 
  default:
    return GNUNET_SYSERR;
  }
}

References data, data_size, GNUNET_OK, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, GNUNET_strdup, GNUNET_SYSERR, and type.

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_typename_to_number()

static uint32_t jwt_typename_to_number ( void *  cls, const char *  jwt_typename  )

static

Convert a type name to the corresponding number.

Parameters

cls	closure, unused
jwt_typename	name to convert

Returns

corresponding number, UINT32_MAX on error

Definition at line 112 of file plugin_reclaim_credential_jwt.c.

{
  unsigned int i;
 
  i = 0;
  while ((NULL != jwt_cred_name_map[i].name) &&
         (0 != strcasecmp (jwt_typename, jwt_cred_name_map[i].name)))
    i++;
  return jwt_cred_name_map[i].number;
}

References jwt_cred_name_map, and name.

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_number_to_typename()

static const char * jwt_number_to_typename ( void *  cls, uint32_t  type  )

static

Convert a type number to the corresponding type string (e.g.

1 to "A")

Parameters

cls	closure, unused
type	number of a type to convert

Returns

corresponding typestring, NULL on error

Definition at line 132 of file plugin_reclaim_credential_jwt.c.

{
  unsigned int i;
 
  i = 0;
  while ((NULL != jwt_cred_name_map[i].name) && (type !=
                                                 jwt_cred_name_map[i].
                                                 number))
    i++;
  return jwt_cred_name_map[i].name;
}

References jwt_cred_name_map, name, number, and type.

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_parse_attributes()

static struct GNUNET_RECLAIM_AttributeList * jwt_parse_attributes ( void *  cls, const char *  data, size_t  data_size  )

static

Parse a JWT and return the respective claim value as Attribute.

Parameters

cls	the plugin
cred	the jwt credential

Returns

a GNUNET_RECLAIM_Attribute, containing the new value

Definition at line 153 of file plugin_reclaim_credential_jwt.c.

{
  struct GNUNET_RECLAIM_AttributeList *attrs;
  const char *jwt_body;
  char delim[] = ".";
  char *jwt_string;
  char *val_str = NULL;
  char *decoded_jwt;
  char *tmp;
  json_t *json_val;
  json_error_t json_err;
 
  attrs = GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
 
  jwt_string = GNUNET_strndup (data, data_size);
  jwt_body = strtok (jwt_string, delim);
  if (NULL == jwt_body)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to parse JSON %s\n", jwt_string);
    return attrs;
  }
  jwt_body = strtok (NULL, delim);
  if (NULL == jwt_body)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to parse JSON %s\n", jwt_string);
    GNUNET_free (jwt_string);
    return attrs;
  }
  GNUNET_STRINGS_base64url_decode (jwt_body, strlen (jwt_body),
                                   (void **) &decoded_jwt);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decoded JWT: %s\n", decoded_jwt);
  GNUNET_assert (NULL != decoded_jwt);
  json_val = json_loads (decoded_jwt, JSON_DECODE_ANY, &json_err);
  GNUNET_free (decoded_jwt);
  {
    const char *key;
    const char *addr_key;
    json_t *value;
    json_t *addr_value;
 
    json_object_foreach (json_val, key, value) {
      if (0 == strcmp ("iss", key))
        continue;
      if (0 == strcmp ("jti", key))
        continue;
      if (0 == strcmp ("exp", key))
        continue;
      if (0 == strcmp ("iat", key))
        continue;
      if (0 == strcmp ("nbf", key))
        continue;
      if (0 == strcmp ("aud", key))
        continue;
      if (0 == strcmp ("address", key))
      {
        if (! json_is_object (value))
        {
          GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                      "address claim in wrong format!");
          continue;
        }
        json_object_foreach (value, addr_key, addr_value) {
          val_str = json_dumps (addr_value, JSON_ENCODE_ANY);
          tmp = val_str;
          // Remove leading " from jasson conversion
          if (tmp[0] == '"')
            tmp++;
          // Remove trailing " from jansson conversion
          if (tmp[strlen (tmp) - 1] == '"')
            tmp[strlen (tmp) - 1] = '\0';
          GNUNET_RECLAIM_attribute_list_add (attrs,
                                             addr_key,
                                             NULL,
                                             GNUNET_RECLAIM_ATTRIBUTE_TYPE_STRING,
                                             tmp,
                                             strlen (val_str));
          GNUNET_free (val_str);
        }
        continue;
      }
      val_str = json_dumps (value, JSON_ENCODE_ANY);
      tmp = val_str;
      // Remove leading " from jasson conversion
      if (tmp[0] == '"')
        tmp++;
      // Remove trailing " from jansson conversion
      if (tmp[strlen (tmp) - 1] == '"')
        tmp[strlen (tmp) - 1] = '\0';
      GNUNET_RECLAIM_attribute_list_add (attrs,
                                         key,
                                         NULL,
                                         GNUNET_RECLAIM_ATTRIBUTE_TYPE_STRING,// FIXME
                                         tmp,
                                         strlen (val_str));
      GNUNET_free (val_str);
    }
  }
  json_decref (json_val);
  GNUNET_free (jwt_string);
  return attrs;
}

References data, data_size, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_new, GNUNET_RECLAIM_attribute_list_add(), GNUNET_RECLAIM_ATTRIBUTE_TYPE_STRING, GNUNET_STRINGS_base64url_decode(), GNUNET_strndup, key, and value.

Referenced by jwt_parse_attributes_c(), and jwt_parse_attributes_p().

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jwt_parse_attributes_c()

static struct GNUNET_RECLAIM_AttributeList * jwt_parse_attributes_c ( void *  cls, const struct GNUNET_RECLAIM_Credential *  cred  )

static

Parse a JWT and return the respective claim value as Attribute.

Parameters

cls	the plugin
cred	the jwt credential

Returns

a GNUNET_RECLAIM_Attribute, containing the new value

Definition at line 268 of file plugin_reclaim_credential_jwt.c.

{
  if (cred->type != GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT)
    return NULL;
  return jwt_parse_attributes (cls, cred->data, cred->data_size);
}

References cred, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, and jwt_parse_attributes().

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_parse_attributes_p()

static struct GNUNET_RECLAIM_AttributeList * jwt_parse_attributes_p ( void *  cls, const struct GNUNET_RECLAIM_Presentation *  cred  )

static

Parse a JWT and return the respective claim value as Attribute.

Parameters

cls	the plugin
cred	the jwt credential

Returns

a GNUNET_RECLAIM_Attribute, containing the new value

Definition at line 285 of file plugin_reclaim_credential_jwt.c.

{
  if (cred->type != GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT)
    return NULL;
  return jwt_parse_attributes (cls, cred->data, cred->data_size);
}

References cred, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, and jwt_parse_attributes().

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_get_issuer()

static char * jwt_get_issuer ( void *  cls, const char *  data, size_t  data_size  )

static

Parse a JWT and return the issuer.

Parameters

cls	the plugin
cred	the jwt credential

Returns

a string, containing the isser

Definition at line 302 of file plugin_reclaim_credential_jwt.c.

{
  const char *jwt_body;
  char *jwt_string;
  char delim[] = ".";
  char *issuer = NULL;
  char *decoded_jwt;
  json_t *issuer_json;
  json_t *json_val;
  json_error_t json_err;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Parsing JWT attributes.\n");
  jwt_string = GNUNET_strndup (data, data_size);
  jwt_body = strtok (jwt_string, delim);
  jwt_body = strtok (NULL, delim);
  GNUNET_STRINGS_base64url_decode (jwt_body, strlen (jwt_body),
                                   (void **) &decoded_jwt);
  json_val = json_loads (decoded_jwt, JSON_DECODE_ANY, &json_err);
  GNUNET_free (decoded_jwt);
  GNUNET_free (jwt_string);
  if (NULL == json_val)
    return NULL;
  issuer_json = json_object_get (json_val, "iss");
  if ((NULL == issuer_json) || (! json_is_string (issuer_json)))
  {
    json_decref (json_val);
    return NULL;
  }
  issuer = GNUNET_strdup (json_string_value (issuer_json));
  json_decref (json_val);
  return issuer;
}

References data, data_size, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_strdup, GNUNET_STRINGS_base64url_decode(), and GNUNET_strndup.

Referenced by jwt_get_issuer_c(), and jwt_get_issuer_p().

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jwt_get_issuer_c()

static char * jwt_get_issuer_c ( void *  cls, const struct GNUNET_RECLAIM_Credential *  cred  )

static

Parse a JWT and return the issuer.

Parameters

cls	the plugin
cred	the jwt credential

Returns

a string, containing the isser

Definition at line 346 of file plugin_reclaim_credential_jwt.c.

{
  if (GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT != cred->type)
    return NULL;
  return jwt_get_issuer (cls, cred->data, cred->data_size);
}

References cred, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, and jwt_get_issuer().

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_get_issuer_p()

static char * jwt_get_issuer_p ( void *  cls, const struct GNUNET_RECLAIM_Presentation *  cred  )

static

Parse a JWT and return the issuer.

Parameters

cls	the plugin
cred	the jwt credential

Returns

a string, containing the isser

Definition at line 363 of file plugin_reclaim_credential_jwt.c.

{
  if (GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT != cred->type)
    return NULL;
  return jwt_get_issuer (cls, cred->data, cred->data_size);
}

References cred, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, and jwt_get_issuer().

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_get_expiration()

static enum GNUNET_GenericReturnValue jwt_get_expiration ( void *  cls, const char *  data, size_t  data_size, struct GNUNET_TIME_Absolute *  exp  )

static

Parse a JWT and return the expiration.

Parameters

cls	the plugin
cred	the jwt credential

Returns

a string, containing the isser

Definition at line 380 of file plugin_reclaim_credential_jwt.c.

{
  const char *jwt_body;
  char *jwt_string;
  char delim[] = ".";
  char *decoded_jwt;
  json_t *exp_json;
  json_t *json_val;
  json_error_t json_err;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Parsing JWT attributes.\n");
  jwt_string = GNUNET_strndup (data, data_size);
  jwt_body = strtok (jwt_string, delim);
  jwt_body = strtok (NULL, delim);
  GNUNET_STRINGS_base64url_decode (jwt_body, strlen (jwt_body),
                                   (void **) &decoded_jwt);
  json_val = json_loads (decoded_jwt, JSON_DECODE_ANY, &json_err);
  GNUNET_free (decoded_jwt);
  GNUNET_free (jwt_string);
  if (NULL == json_val)
    return GNUNET_SYSERR;
  exp_json = json_object_get (json_val, "exp");
  if ((NULL == exp_json) || (! json_is_integer (exp_json)))
  {
    json_decref (json_val);
    return GNUNET_SYSERR;
  }
  exp->abs_value_us = json_integer_value (exp_json) * 1000 * 1000;
  json_decref (json_val);
  return GNUNET_OK;
}

References GNUNET_TIME_Absolute::abs_value_us, data, data_size, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_OK, GNUNET_STRINGS_base64url_decode(), GNUNET_strndup, and GNUNET_SYSERR.

Referenced by jwt_get_expiration_c(), and jwt_get_expiration_p().

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jwt_get_expiration_c()

static enum GNUNET_GenericReturnValue jwt_get_expiration_c ( void *  cls, const struct GNUNET_RECLAIM_Credential *  cred, struct GNUNET_TIME_Absolute *  exp  )

static

Parse a JWT and return the expiration.

Parameters

cls	the plugin
cred	the jwt credential

Returns

the expirati

Definition at line 424 of file plugin_reclaim_credential_jwt.c.

{
  if (GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT != cred->type)
    return GNUNET_NO;
  return jwt_get_expiration (cls, cred->data, cred->data_size, exp);
}

References cred, GNUNET_NO, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, and jwt_get_expiration().

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_get_expiration_p()

static enum GNUNET_GenericReturnValue jwt_get_expiration_p ( void *  cls, const struct GNUNET_RECLAIM_Presentation *  cred, struct GNUNET_TIME_Absolute *  exp  )

static

Parse a JWT and return the expiration.

Parameters

cls	the plugin
cred	the jwt credential

Returns

a string, containing the isser

Definition at line 442 of file plugin_reclaim_credential_jwt.c.

{
  if (GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT != cred->type)
    return GNUNET_NO;
  return jwt_get_expiration (cls, cred->data, cred->data_size, exp);
}

References cred, GNUNET_NO, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, and jwt_get_expiration().

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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jwt_create_presentation()

static enum GNUNET_GenericReturnValue jwt_create_presentation ( void *  cls, const struct GNUNET_RECLAIM_Credential *  cred, const struct GNUNET_RECLAIM_AttributeList *  attrs, struct GNUNET_RECLAIM_Presentation **  presentation  )

static

Definition at line 453 of file plugin_reclaim_credential_jwt.c.

{
  if (GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT != cred->type)
    return GNUNET_NO;
  *presentation = GNUNET_RECLAIM_presentation_new (
    GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT,
    cred->data,
    cred->data_size);
  return GNUNET_OK;
}

References cred, GNUNET_NO, GNUNET_OK, GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT, and GNUNET_RECLAIM_presentation_new().

Referenced by libgnunet_plugin_reclaim_credential_jwt_init().

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libgnunet_plugin_reclaim_credential_jwt_init()

void * libgnunet_plugin_reclaim_credential_jwt_init

(

void *

cls

)

Entry point for the plugin.

Parameters

cls

NULL

Returns

the exported block API

Definition at line 478 of file plugin_reclaim_credential_jwt.c.

{
  struct GNUNET_RECLAIM_CredentialPluginFunctions *api;
 
  api = GNUNET_new (struct GNUNET_RECLAIM_CredentialPluginFunctions);
  api->value_to_string = &jwt_value_to_string;
  api->string_to_value = &jwt_string_to_value;
  api->typename_to_number = &jwt_typename_to_number;
  api->number_to_typename = &jwt_number_to_typename;
  api->get_attributes = &jwt_parse_attributes_c;
  api->get_issuer = &jwt_get_issuer_c;
  api->get_expiration = &jwt_get_expiration_c;
  api->value_to_string_p = &jwt_value_to_string;
  api->string_to_value_p = &jwt_string_to_value;
  api->typename_to_number_p = &jwt_typename_to_number;
  api->number_to_typename_p = &jwt_number_to_typename;
  api->get_attributes_p = &jwt_parse_attributes_p;
  api->get_issuer_p = &jwt_get_issuer_p;
  api->get_expiration_p = &jwt_get_expiration_p;
  api->create_presentation = &jwt_create_presentation;
  return api;
}

References GNUNET_RECLAIM_CredentialPluginFunctions::create_presentation, GNUNET_RECLAIM_CredentialPluginFunctions::get_attributes, GNUNET_RECLAIM_CredentialPluginFunctions::get_attributes_p, GNUNET_RECLAIM_CredentialPluginFunctions::get_expiration, GNUNET_RECLAIM_CredentialPluginFunctions::get_expiration_p, GNUNET_RECLAIM_CredentialPluginFunctions::get_issuer, GNUNET_RECLAIM_CredentialPluginFunctions::get_issuer_p, GNUNET_new, jwt_create_presentation(), jwt_get_expiration_c(), jwt_get_expiration_p(), jwt_get_issuer_c(), jwt_get_issuer_p(), jwt_number_to_typename(), jwt_parse_attributes_c(), jwt_parse_attributes_p(), jwt_string_to_value(), jwt_typename_to_number(), jwt_value_to_string(), GNUNET_RECLAIM_CredentialPluginFunctions::number_to_typename, GNUNET_RECLAIM_CredentialPluginFunctions::number_to_typename_p, GNUNET_RECLAIM_CredentialPluginFunctions::string_to_value, GNUNET_RECLAIM_CredentialPluginFunctions::string_to_value_p, GNUNET_RECLAIM_CredentialPluginFunctions::typename_to_number, GNUNET_RECLAIM_CredentialPluginFunctions::typename_to_number_p, GNUNET_RECLAIM_CredentialPluginFunctions::value_to_string, and GNUNET_RECLAIM_CredentialPluginFunctions::value_to_string_p.

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libgnunet_plugin_reclaim_credential_jwt_done()

void * libgnunet_plugin_reclaim_credential_jwt_done

(

void *

cls

)

Exit point from the plugin.

Parameters

cls	the return value from libgnunet_plugin_block_test_init()

Returns

NULL

Definition at line 512 of file plugin_reclaim_credential_jwt.c.

{
  struct GNUNET_RECLAIM_CredentialPluginFunctions *api = cls;
 
  GNUNET_free (api);
  return NULL;
}

References GNUNET_RECLAIM_CredentialPluginFunctions::cls, and GNUNET_free.

Variable Documentation

name

const char* name

Definition at line 99 of file plugin_reclaim_credential_jwt.c.

Referenced by jwt_number_to_typename(), and jwt_typename_to_number().

number

uint32_t number

Definition at line 100 of file plugin_reclaim_credential_jwt.c.

Referenced by jwt_number_to_typename().

struct { ... } jwt_cred_name_map[]

Initial value:

= { { "JWT", GNUNET_RECLAIM_CREDENTIAL_TYPE_JWT },
                          { NULL, UINT32_MAX } }

Mapping of credential type numbers to human-readable credential type names.

Referenced by jwt_number_to_typename(), and jwt_typename_to_number().