Mercurial > libervia-backend
view sat/bridge/bridge_constructor/bridge_template.ini @ 3081:fd593b448bee
plugins (imap, maildir, smtp): removed plugins IMAP, Maildir and SMTP:
they were experimental plugins, are not used and Maildir has not been ported to Python 3
author | Goffi <goffi@goffi.org> |
---|---|
date | Fri, 06 Dec 2019 15:02:02 +0100 |
parents | f8cc88c773c8 |
children | 7574f795bd1e |
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[DEFAULT] doc_profile=profile: Name of the profile. doc_profile_key=profile_key: Profile key which can be either a magic (eg: @DEFAULT@) or the name of an existing profile. doc_security_limit=security_limit: -1 means no security, 0 is the maximum security then the higher the less secure ;signals [connected] type=signal category=core sig_in=ss doc=Connection is done doc_param_0=jid_s: the JID that we were assigned by the server, as the resource might differ from the JID we asked for. doc_param_1=%(doc_profile)s [disconnected] type=signal category=core sig_in=s doc=Connection is finished or lost doc_param_0=%(doc_profile)s [newContact] type=signal category=core sig_in=sa{ss}ass doc=New contact received in roster doc_param_0=contact_jid: JID which has just been added doc_param_1=attributes: Dictionary of attributes where keys are: - name: name of the contact - to: "True" if the contact give its presence information to us - from: "True" if contact is registred to our presence information - ask: "True" is subscription is pending doc_param_2=groups: Roster's groups where the contact is doc_param_3=%(doc_profile)s [messageNew] type=signal category=core sig_in=sdssa{ss}a{ss}sa{ss}s doc=A message has been received doc_param_0=uid: unique ID of the message (id specific to SàT, this it *NOT* an XMPP id) doc_param_1=timestamp: when the message was sent (or declared sent for delayed messages) doc_param_2=from_jid: JID where the message is comming from doc_param_3=to_jid: JID where the message must be sent doc_param_4=message: message itself, can be in several languages (key is language code or '' for default) doc_param_5=subject: subject of the message, can be in several languages (key is language code or '' for default) doc_param_6=mess_type: Type of the message (cf RFC 6121 §5.2.2) + C.MESS_TYPE_INFO (system info) doc_param_7=extra: extra message information, can have data added by plugins and/or: - thread: id of the thread - thread_parent: id of the parent of the current thread - received_timestamp: date of receiption for delayed messages - delay_sender: entity which has originally sent or which has delayed the message - info_type: subtype for info messages doc_param_8=%(doc_profile)s [messageEncryptionStarted] type=signal category=core sig_in=sss doc=A message encryption session has been started doc_param_0=to_jid: JID of the recipient (bare jid if it's encrypted for all devices) doc_param_1=encryption_data: (JSON_OBJ) data of the encryption algorithm used, encoded as a json object. it always has the following keys: - name: human readable name of the algorithm - namespace: namespace of the encryption plugin following keys are present if suitable: - directed_devices: list or resource where session is encrypted doc_param_2=%(doc_profile_key)s [messageEncryptionStopped] type=signal category=core sig_in=sa{ss}s doc=A message encryption session has been stopped doc_param_0=to_jid: JID of the recipient (full jid if it's only stopped for one device) doc_param_1=encryption_data: data of the encryption algorithm stopped, has a least following keys: - name: human readable name of the algorithm - namespace: namespace of the encryption plugin doc_param_2=%(doc_profile_key)s [presenceUpdate] type=signal category=core sig_in=ssia{ss}s doc=Somebody changed his presence information. doc_param_0=entity_jid: JID from which we have presence informatios doc_param_1=show: availability status (see RFC 6121 §4.7.2.1) doc_param_2=priority: Priority level of the ressource (see RFC 6121 §4.7.2.3) doc_param_3=statuses: Natural language description of the availability status (see RFC 6121 §4.7.2.2) doc_param_4=%(doc_profile)s [subscribe] type=signal category=core sig_in=sss doc=Somebody wants to be added in roster doc_param_0=sub_type: Subscription states (see RFC 6121 §3) doc_param_1=entity_jid: JID from which the subscription is coming doc_param_2=%(doc_profile)s [paramUpdate] type=signal category=core sig_in=ssss doc=A parameter has been changed doc_param_0=name: Name of the updated parameter doc_param_1=value: New value of the parameter doc_param_2=category: Category of the updated parameter doc_param_3=%(doc_profile)s [contactDeleted] type=signal category=core sig_in=ss doc=A contact has been supressed from roster doc_param_0=entity_jid: JID of the contact removed from roster doc_param_1=%(doc_profile)s [actionNew] type=signal category=core sig_in=a{ss}sis doc=A frontend action is requested doc_param_0=action_data: a dict where key can be: - xmlui: a XMLUI need to be displayed - progress: a progress id - meta_*: meta information on the action, used to make automation more easy, some are defined below - meta_from_jid: origin of the request - meta_type: type of the request, can be one of: - C.META_TYPE_FILE: a file transfer request validation - C.META_TYPE_OVERWRITE: a file overwriting confirmation - meta_progress_id: progress id linked to this action doc_param_1=id: action id This id can be used later by frontends to announce to other ones that the action is managed and can now be ignored. doc_param_2=%(doc_security_limit)s doc_param_3=%(doc_profile)s [entityDataUpdated] type=signal category=core sig_in=ssss doc=An entity's data has been updated doc_param_0=jid: entity's bare jid doc_param_1=name: Name of the updated value doc_param_2=value: New value doc_param_3=%(doc_profile)s [progressStarted] type=signal category=core sig_in=sa{ss}s doc=A progressing operation has just started doc_param_0=id: id of the progression operation doc_param_1=metadata: dict of progress metadata, key can be: - name: name of the progression, full path for a file - direction: "in" for incoming data, "out" else - type: type of the progression: C.META_TYPE_FILE: file transfer doc_param_2=%(doc_profile)s [progressFinished] type=signal category=core sig_in=sa{ss}s doc=A progressing operation is finished doc_param_0=id: id of the progression operation doc_param_1=metadata: dict of progress status metadata, key can be: - hash: value of the computed hash - hash_algo: alrorithm used to compute hash - hash_verified: C.BOOL_TRUE if hash is verified and OK C.BOOL_FALSE if hash was not received ([progressError] will be used if there is a mismatch) - url: url linked to the progression (e.g. download url after a file upload) doc_param_2=%(doc_profile)s [progressError] type=signal category=core sig_in=sss doc=There was an error during progressing operation doc_param_0=id: id of the progression operation doc_param_1=error: error message doc_param_2=%(doc_profile)s [_debug] type=signal category=core sig_in=sa{ss}s doc=Debug method, useful for developers doc_param_0=action: action to do doc_param_1=params: action parameters doc_param_2=%(doc_profile)s ;methods [getReady] async= type=method category=core sig_in= sig_out= doc=Return when backend is initialised [getVersion] type=method category=core sig_in= sig_out=s doc=Get "Salut à Toi" full version [getFeatures] type=method category=core sig_in=s sig_out=a{sa{ss}} doc=Get available features and plugins features can changes for differents profiles, e.g. because of differents server capabilities doc_param_0=%(doc_profile_key)s doc_return=dictionary of available features: plugin import name is used as key, data is an other dict managed by the plugin async= [profileNameGet] type=method category=core sig_in=s sig_out=s param_0_default="@DEFAULT@" doc=Get real profile name from profile key doc_param_0=%(doc_profile_key)s doc_return=Real profile name [profilesListGet] type=method category=core sig_in=bb sig_out=as param_0_default=True param_1_default=False doc_param_0=clients: get clients profiles doc_param_1=components: get components profiles doc=Get list of profiles [profileSetDefault] type=method category=core sig_in=s sig_out= doc_param_0=%(doc_profile)s doc=Set default profile [getEntityData] type=method category=core sig_in=sass sig_out=a{ss} doc=Get data in cache for an entity doc_param_0=jid: entity's bare jid doc_param_1=keys: list of keys to get doc_param_2=%(doc_profile)s doc_return=dictionary of asked key, if key doesn't exist, the resulting dictionary will not have the key [getEntitiesData] type=method category=core sig_in=asass sig_out=a{sa{ss}} doc=Get data in cache for several entities at once doc_param_0=jids: list of entities bare jid, or empty list to have all jids in cache doc_param_1=keys: list of keys to get doc_param_2=%(doc_profile)s doc_return=dictionary with jids as keys and dictionary of asked key as values if key doesn't exist for a jid, the resulting dictionary will not have it [profileCreate] async= type=method category=core sig_in=sss sig_out= param_1_default='' param_2_default='' doc=Create a new profile doc_param_0=%(doc_profile)s doc_param_1=password: password of the profile doc_param_2=component: set to component entry point if it is a component, else use empty string doc_return=callback is called when profile actually exists in database and memory errback is called with error constant as parameter: - ConflictError: the profile name already exists - CancelError: profile creation canceled - NotFound: component entry point is not available [asyncDeleteProfile] async= type=method category=core sig_in=s sig_out= doc=Delete a profile doc_param_0=%(doc_profile)s doc_return=callback is called when profile has been deleted from database and memory errback is called with error constant as parameter: - ProfileUnknownError: the profile name is unknown - ConnectedProfileError: a connected profile would not be deleted [connect] async= type=method category=core sig_in=ssa{ss} sig_out=b param_0_default="@DEFAULT@" param_1_default='' param_2_default={} doc=Connect a profile doc_param_0=%(doc_profile_key)s doc_param_1=password: the SàT profile password doc_param_2=options: connection options doc_return=a deferred boolean or failure: - boolean if the profile authentication succeed: - True if the XMPP connection was already established - False if the XMPP connection has been initiated (it may still fail) - failure if the profile authentication failed [profileStartSession] async= type=method category=core sig_in=ss sig_out=b param_0_default='' param_1_default="@DEFAULT@" doc=Start a profile session without connecting it (if it's not already the case) doc_param_0=password: the SàT profile password doc_param_1=%(doc_profile_key)s doc_return=D(bool): - True if the profile session was already started - False else [profileIsSessionStarted] type=method category=core sig_in=s sig_out=b param_0_default="@DEFAULT@" doc=Tell if a profile session is loaded doc_param_0=%(doc_profile_key)s [disconnect] async= type=method category=core sig_in=s sig_out= param_0_default="@DEFAULT@" doc=Disconnect a profile doc_param_0=%(doc_profile_key)s [isConnected] type=method category=core sig_in=s sig_out=b param_0_default="@DEFAULT@" doc=Tell if a profile is connected doc_param_0=%(doc_profile_key)s [getContacts] async= type=method category=core sig_in=s sig_out=a(sa{ss}as) param_0_default="@DEFAULT@" doc=Return information about all contacts (the roster) doc_param_0=%(doc_profile_key)s doc_return=array of tuples with the following values: - JID of the contact - list of attributes as in [newContact] - groups where the contact is [getContactsFromGroup] type=method category=core sig_in=ss sig_out=as param_1_default="@DEFAULT@" doc=Return information about all contacts doc_param_0=group: name of the group to check doc_param_1=%(doc_profile_key)s doc_return=array of jids [getMainResource] type=method category=core sig_in=ss sig_out=s param_1_default="@DEFAULT@" doc=Return the last resource connected for a contact doc_param_0=contact_jid: jid of the contact doc_param_1=%(doc_profile_key)s doc_return=the resource connected of the contact with highest priority, or "" [getPresenceStatuses] type=method category=core sig_in=s sig_out=a{sa{s(sia{ss})}} param_0_default="@DEFAULT@" doc=Return presence information of all contacts doc_param_0=%(doc_profile_key)s doc_return=Dict of presence with bare JID of contact as key, and value as follow: A dict where key is the resource and the value is a tuple with (show, priority, statuses) as for [presenceUpdate] [getWaitingSub] type=method category=core sig_in=s sig_out=a{ss} param_0_default="@DEFAULT@" doc=Get subscription requests in queue doc_param_0=%(doc_profile_key)s doc_return=Dict where contact JID is the key, and value is the subscription type [messageSend] async= type=method category=core sig_in=sa{ss}a{ss}sa{ss}s sig_out= param_2_default={} param_3_default="auto" param_4_default={} param_5_default="@NONE@" doc=Send a message doc_param_0=to_jid: JID of the recipient doc_param_1=message: body of the message: key is the language of the body, use '' when unknown doc_param_2=subject: Subject of the message key is the language of the subject, use '' when unknown doc_param_3=mess_type: Type of the message (cf RFC 6121 §5.2.2) or "auto" for automatic type detection doc_param_4=extra: optional data that can be used by a plugin to build more specific messages doc_param_5=%(doc_profile_key)s [messageEncryptionStart] async= type=method category=core sig_in=ssbs sig_out= param_1_default='' param_2_default=False param_3_default="@NONE@" doc=Start an encryption session doc_param_0=to_jid: JID of the recipient (bare jid if it must be encrypted for all devices) doc_param_1=namespace: namespace of the encryption algorithm to use doc_param_2=replace: if True and an encryption session already exists, it will be replaced by this one else a ConflictError will be raised doc_param_3=%(doc_profile_key)s [messageEncryptionStop] async= type=method category=core sig_in=ss sig_out= doc=Stop an encryption session doc_param_0=to_jid: JID of the recipient (full jid if encryption must be stopped for one device only) doc_param_1=%(doc_profile_key)s [messageEncryptionGet] type=method category=core sig_in=ss sig_out=s doc=Retrieve encryption data for a given entity doc_param_0=to_jid: bare JID of the recipient doc_param_1=%(doc_profile_key)s doc_return=(JSON_OBJ) empty string if session is unencrypted, else a json encoded objects. In case of dict, following keys are always present: - name: human readable name of the encryption algorithm - namespace: namespace of the plugin following key can be present if suitable: - directed_devices: list or resource where session is encrypted [encryptionNamespaceGet] type=method category=core sig_in=s sig_out=s doc=Get algorithm namespace from its name [encryptionPluginsGet] type=method category=core sig_in= sig_out=aa{ss} doc=Retrieve registered plugins for encryption [encryptionTrustUIGet] async= type=method category=core sig_in=sss sig_out=s doc=Get XMLUI to manage trust for given encryption algorithm doc_param_0=to_jid: bare JID of entity to manage doc_param_1=namespace: namespace of the algorithm to manage doc_param_2=%(doc_profile_key)s doc_return=(XMLUI) UI of the trust management [setPresence] type=method category=core sig_in=ssa{ss}s sig_out= param_0_default='' param_1_default='' param_2_default={} param_3_default="@DEFAULT@" doc=Set presence information for the profile doc_param_0=to_jid: the JID to who we send the presence data (emtpy string for broadcast) doc_param_1=show: as for [presenceUpdate] doc_param_2=statuses: as for [presenceUpdate] doc_param_3=%(doc_profile_key)s [subscription] type=method category=core sig_in=sss sig_out= param_2_default="@DEFAULT@" doc=Send subscription request/answer to a contact doc_param_0=sub_type: as for [subscribe] doc_param_1=entity: as for [subscribe] doc_param_2=%(doc_profile_key)s [getConfig] type=method category=core sig_in=ss sig_out=s doc=get main configuration option doc_param_0=section: section of the configuration file (empty string for DEFAULT) doc_param_1=name: name of the option [setParam] type=method category=core sig_in=sssis sig_out= param_3_default=-1 param_4_default="@DEFAULT@" doc=Change a parameter doc_param_0=name: Name of the parameter to change doc_param_1=value: New Value of the parameter doc_param_2=category: Category of the parameter to change doc_param_3=%(doc_security_limit)s doc_param_4=%(doc_profile_key)s [getParamA] type=method category=core sig_in=ssss sig_out=s param_2_default="value" param_3_default="@DEFAULT@" doc=Helper method to get a parameter's attribute *when profile is connected* doc_param_0=name: as for [setParam] doc_param_1=category: as for [setParam] doc_param_2=attribute: Name of the attribute doc_param_3=%(doc_profile_key)s [asyncGetParamA] async= type=method category=core sig_in=sssis sig_out=s param_2_default="value" param_3_default=-1 param_4_default="@DEFAULT@" doc=Helper method to get a parameter's attribute doc_param_0=name: as for [setParam] doc_param_1=category: as for [setParam] doc_param_2=attribute: Name of the attribute doc_param_3=%(doc_security_limit)s doc_param_4=%(doc_profile_key)s [asyncGetParamsValuesFromCategory] async= type=method category=code sig_in=sis sig_out=a{ss} param_1_default=-1 param_2_default="@DEFAULT@" doc=Get "attribute" for all params of a category doc_param_0=category: as for [setParam] doc_param_1=%(doc_security_limit)s doc_param_2=%(doc_profile_key)s [getParamsUI] async= type=method category=core sig_in=iss sig_out=s param_0_default=-1 param_1_default='' param_2_default="@DEFAULT@" doc=Return a SàT XMLUI for parameters, eventually restrict the result to the parameters concerning a given frontend doc_param_0=%(doc_security_limit)s doc_param_1=app: name of the frontend requesting the parameters, or '' to get all parameters doc_param_2=%(doc_profile_key)s [getParamsCategories] type=method category=core sig_in= sig_out=as doc=Get all categories currently existing in parameters doc_return=list of categories [paramsRegisterApp] type=method category=core sig_in=sis sig_out= param_1_default=-1 param_2_default='' doc=Register frontend's specific parameters doc_param_0=xml: XML definition of the parameters to be added doc_param_1=%(doc_security_limit)s doc_param_2=app: name of the frontend registering the parameters [historyGet] async= type=method category=core sig_in=ssiba{ss}s sig_out=a(sdssa{ss}a{ss}sa{ss}) param_3_default=True param_4_default='' param_5_default="@NONE@" doc=Get history of a communication between two entities doc_param_0=from_jid: source JID (bare jid for catch all, full jid else) doc_param_1=to_jid: dest JID (bare jid for catch all, full jid else) doc_param_2=limit: max number of history elements to get (0 for the whole history) doc_param_3=between: True if we want history between the two jids (in both direction), False if we only want messages from from_jid to to_jid doc_param_4=filters: patterns to filter the history results, can be: - body: pattern must be in message body - search: pattern must be in message body or source resource - types: type must be one of those, values are separated by spaces - not_types: type must not be one of those, values are separated by spaces - before_uid: check only message received before message with given uid doc_param_5=%(doc_profile)s doc_return=Ordered list (by timestamp) of data as in [messageNew] (without final profile) [addContact] type=method category=core sig_in=ss sig_out= param_1_default="@DEFAULT@" doc=Add a contact to profile's roster doc_param_0=entity_jid: JID to add to roster doc_param_1=%(doc_profile_key)s [updateContact] async= type=method category=core sig_in=ssass sig_out= param_3_default="@DEFAULT@" doc=update a contact in profile's roster doc_param_0=entity_jid: JID update in roster doc_param_1=name: roster's name for the entity doc_param_2=groups: list of group where the entity is doc_param_3=%(doc_profile_key)s [delContact] async= type=method category=core sig_in=ss sig_out= param_1_default="@DEFAULT@" doc=Remove a contact from profile's roster doc_param_0=entity_jid: JID to remove from roster doc_param_1=%(doc_profile_key)s [rosterResync] async= type=method category=core sig_in=s sig_out= param_0_default="@DEFAULT@" doc=Do a full resynchronisation of roster with server doc_param_0=%(doc_profile_key)s [launchAction] async= type=method category=core sig_in=sa{ss}s sig_out=a{ss} param_2_default="@DEFAULT@" doc=Launch a registred action doc_param_0=callback_id: id of the registred callback doc_param_1=data: optional data doc_param_2=%(doc_profile_key)s doc_return=dict where key can be: - xmlui: a XMLUI need to be displayed [actionsGet] type=method category=core sig_in=s sig_out=a(a{ss}si) param_0_default="@DEFAULT@" doc=Get all not yet answered actions doc_param_0=%(doc_profile_key)s doc_return=list of data as for [actionNew] (without the profile) [progressGet] type=method category=core sig_in=ss sig_out=a{ss} doc=Get progress information for an action doc_param_0=id: id of the progression status doc_param_1=%(doc_profile)s doc_return=dict with progress informations: - position: current position - size: end position (optional if not known) other metadata may be present [progressGetAllMetadata] type=method category=core sig_in=s sig_out=a{sa{sa{ss}}} doc=Get all active progress informations doc_param_0=%(doc_profile)s or C.PROF_KEY_ALL for all profiles doc_return= a dict which map profile to progress_dict progress_dict map progress_id to progress_metadata progress_metadata is the same dict as sent by [progressStarted] [progressGetAll] type=method category=core sig_in=s sig_out=a{sa{sa{ss}}} doc=Get all active progress informations doc_param_0=%(doc_profile)s or C.PROF_KEY_ALL for all profiles doc_return= a dict which map profile to progress_dict progress_dict map progress_id to progress_data progress_data is the same dict as returned by [progressGet] [menusGet] type=method category=core sig_in=si sig_out=a(ssasasa{ss}) doc=Get all additional menus doc_param_0=language: language in which the menu should be translated (empty string for default) doc_param_1=security_limit: %(doc_security_limit)s doc_return=list of tuple with the following value: - menu_id: menu id (same as callback id) - menu_type: Type which can be: * NORMAL: Classical application menu - menu_path: raw path of the menu - menu_path_i18n: translated path of the menu - extra: extra data, like icon name [menuLaunch] async= type=method category=core sig_in=sasa{ss}is sig_out=a{ss} doc=Launch a registred menu doc_param_0=menu_type: type of the menu (C.MENU_*) doc_param_1=path: canonical (untranslated) path of the menu doc_param_2=data: optional data doc_param_3=%(doc_security_limit)s doc_param_4=%(doc_profile_key)s doc_return=dict where key can be: - xmlui: a XMLUI need to be displayed [menuHelpGet] type=method category=core sig_in=ss sig_out=s param_2="NORMAL" doc=Get help information for a menu doc_param_0=menu_id: id of the menu (same as callback_id) doc_param_1=language: language in which the menu should be translated (empty string for default) doc_return=Translated help string [discoInfos] async= type=method category=core sig_in=ssbs sig_out=(asa(sss)a{sa(a{ss}as)}) param_1_default=u'' param_2_default=True param_3_default="@DEFAULT@" doc=Discover infos on an entity doc_param_0=entity_jid: JID to discover doc_param_1=node: node to use doc_param_2=use_cache: use cached data if available doc_param_3=%(doc_profile_key)s doc_return=discovery data: - list of features - list of identities (category, type, name) - dictionary of extensions (FORM_TYPE as key), with value of: - list of field which are: - dictionary key/value where key can be: * var * label * type * desc - list of values [discoItems] async= type=method category=core sig_in=ssbs sig_out=a(sss) param_1_default=u'' param_2_default=True param_3_default="@DEFAULT@" doc=Discover items of an entity doc_param_0=entity_jid: JID to discover doc_param_1=node: node to use doc_param_2=use_cache: use cached data if available doc_param_3=%(doc_profile_key)s doc_return=array of tuple (entity, node identifier, name) [discoFindByFeatures] async= type=method category=core sig_in=asa(ss)bbbbbs sig_out=(a{sa(sss)}a{sa(sss)}a{sa(sss)}) param_2_default=False param_3_default=True param_4_default=True param_5_default=True param_6_default=False param_7_default="@DEFAULT@" doc=Discover items of an entity doc_param_0=namespaces: namespaces of the features to check doc_param_1=identities: identities to filter doc_param_2=bare_jid: if True only retrieve bare jids if False, retrieve full jids of connected resources doc_param_3=service: True to check server's services doc_param_4=roster: True to check connected devices from people in roster doc_param_5=own_jid: True to check profile's jid doc_param_6=local_device: True to check device on which the backend is running doc_param_7=%(doc_profile_key)s doc_return=tuple of maps of found entities full jids to their identities. Maps are in this order: - services entities - own entities (i.e. entities linked to profile's jid) - roster entities [saveParamsTemplate] type=method category=core sig_in=s sig_out=b doc=Save parameters template to xml file doc_param_0=filename: output filename doc_return=boolean (True in case of success) [loadParamsTemplate] type=method category=core sig_in=s sig_out=b doc=Load parameters template from xml file doc_param_0=filename: input filename doc_return=boolean (True in case of success) [sessionInfosGet] async= type=method category=core sig_in=s sig_out=a{ss} doc=Get various informations on current profile session doc_param_0=%(doc_profile_key)s doc_return=session informations, with at least the following keys: jid: current full jid started: date of creation of the session (Epoch time) [namespacesGet] type=method category=core sig_in= sig_out=a{ss} doc=Get a dict to short name => whole namespaces doc_return=namespaces mapping [imageCheck] type=method category=core sig_in=s sig_out=s doc=Analyze an image a return a report doc_return=serialized report [imageResize] async= type=method category=core sig_in=sii sig_out=s doc=Create a new image with desired size doc_param_0=image_path: path of the image to resize doc_param_1=width: width of the new image doc_param_2=height: height of the new image doc_return=path of the new image with desired size the image must be deleted once not needed anymore