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RestClient

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pozil edited this page Nov 20, 2023 · 21 revisions

virtual RestClient

This class provides an example of an intelligent abstraction for making REST callouts to external endpoints. It utilizes NamedCredentials for security. This class is designated as Virtual so that API Service classes can extend it, and make use of it's methods easily. See the CovidTrackerAPI class for an example of how an API service class can extend RestClient. This class also provides static methods - so that the abstractions provided can be used in a one-off or ad-hoc manner for situations where a full API Service class isn't needed. More on Named Credentials: https://sfdc.co/named-credentials

Group Shared Code

See AtFutureRecipes

See QueueableWithCalloutRecipes

See ApiServiceRecipes

See CalloutRecipes

Constructors

public RestClient(String namedCredential)

Constructor that sets Named Credential

Parameters

Param Description
namedCredential name of the Named Credential to use

protected RestClient()

SUPPRESSWARNINGS

This constructor isn't intended for use, which is why it's access modifier is 'Protected'. However, any child class extending this class will either have to implement constructors matching the one above, or this constructor must exist. In order to make this abstraction as useful as possible, we've elected to leave this constructor here, but unavailable to anything but inner classes and classes that extend this one.

Fields

private defaultHeaders → Map<String,String>

TESTVISIBLE

These two properties are not public - which means that in order to manipulate them during a Unit test, we have to mark them

Properties

protected namedCredentialName → String

TESTVISIBLE

The name of the Named Credential to use

Methods

protected HttpResponse makeApiCall(HttpVerb method, String path, String query, String body, Map<String,String> headers)

TESTVISIBLE

SUPPRESSWARNINGS

Omnibus callout method. This is the primary method for making a REST callout. Most of the other methods in this class serve as convient, syntactic sugar on this method.

Parameters

Param Description
method Enum HTTP verb to use. i.e. GET
path patch component of the callout url i.e. /services/data/v39.0/SObjects
query Query portion of the URL i.e. ?q=SELECT Id FROM Account
body JSON string representing the body of the callout in post/patch situations
headers A map<String,String> of headers to use while making this callout

Returns

Type Description
HttpResponse HttpResponse HttpResponse Obj

protected HttpResponse makeApiCall(HttpVerb method, String path, String query, String body)

TESTVISIBLE

SUPPRESSWARNINGS

Makes an HTTP Callout to an api resource. Convienence method that assumes the Default Headers.

Parameters

Param Description
method HTTPVerb to use. See the enum above.
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar
body Body to send with this call.

Returns

Type Description
HttpResponse HttpResponse

protected HttpResponse makeApiCall(HttpVerb method, String path, String query)

TESTVISIBLE

convenience version of makeApiCall without body param. Invokes omnibus version above, with blank body param and default headers.

Parameters

Param Description
method HTTPVerb to use. See the enum above.
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse makeApiCall(HttpVerb method, String path)

TESTVISIBLE

convenience version of makeApiCall without body or query params. Invokes omnibus version above, with blank body and query params

Parameters

Param Description
method HTTPVerb to use. See the enum above.
path Http path component of the URL. ie: /path/to/resource

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse get(String path)

TESTVISIBLE

convenience method for a GET Call that only requires a path

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse get(String path, String query)

TESTVISIBLE

convenience method for a GET Call that only requires a path and query

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse del(String path)

TESTVISIBLE

convenience method for deleteing a resource based only on path

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse del(String path, String query)

TESTVISIBLE

convenience method for a Delete Call that only requires a path and query

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse post(String path, String body)

TESTVISIBLE

convenience method for a POST Call that only requires a path and body

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource
body JSON string to post

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse post(String path, String query, String body)

TESTVISIBLE

convenience method for a POST Call that only requires a path, query and body

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar
body JSON string to post

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse put(String path, String body)

TESTVISIBLE

convenience method for a PUT Call that only requires a path and body

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource
body JSON string to post

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse put(String path, String query, String body)

TESTVISIBLE

convenience method for a PUT Call that only requires a path, query and body

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar
body JSON string to post

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse patch(String path, String body)

TESTVISIBLE

convenience method for a PATCH Call that only requires a path, query and body

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource
body JSON string to post

Returns

Type Description
HttpResponse HTTPResponse

protected HttpResponse patch(String path, String query, String body)

TESTVISIBLE

convenience method for a PATCH Call that only requires a path, query and body

Parameters

Param Description
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar
body JSON string to post

Returns

Type Description
HttpResponse HTTPResponse

protected String ensureStringEndsInSlash(String resource)

TESTVISIBLE

Ensures that the inputted string ends in a / makes callouts more robust.

Parameters

Param Description
resource string to ensure ends in /

Returns

Type Description
String inputted string with / if it didn't already end in one.

public static HttpResponse makeApiCall(String namedCredential, HttpVerb method, String path, String query, String body, Map<String,String> headers)

SUPPRESSWARNINGS

A static wrapper for the main makeApiCall method

Parameters

Param Description
namedCredential The named credential to use
method HTTPVerb enum value. See Enum above
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar
body JSON string to post
headers Map<String,String> representing outgoing Request headers

Returns

Type Description
HttpResponse HTTPResponse

Example

System.Debug(RestClient.makeApiCall('GoogleBooksAPI',
                                     RestClient.HttpVerb.GET,
                                     'volumes',
                                     'q=salesforce',
                                     '',
                                     new Map<String,String>()));

public static HttpResponse makeApiCall(String namedCredential, HttpVerb method, String path, String query)

SUPPRESSWARNINGS

A static wrapper for the main makeApiCall method that assumes default headers.

Parameters

Param Description
namedCredential The named credential to use
method HTTPVerb enum value. See Enum above
path Http path component of the URL. ie: /path/to/resource
query Query component of the URL ie: after ?foo=bar

Returns

Type Description
HttpResponse HTTPResponse

Example

System.Debug(RestClient.makeApiCall('GoogleBooksAPI',
                                     RestClient.HttpVerb.GET,
                                     'volumes',
                                     'q=salesforce'));

public static HttpResponse makeApiCall(String namedCredential, HttpVerb method, String path)

A static wrapper for the main makeApiCall method where you only need the path

Parameters

Param Description
namedCredential The named credential to use
method HTTPVerb enum value. See Enum above
path Http path component of the URL. ie: /path/to/resource

Returns

Type Description
HttpResponse HTTPResponse

Example

System.Debug(RestClient.makeApiCall('GoogleBooksAPI',
                                     RestClient.HttpVerb.GET,
                                     'volumes'));

Enums

HttpVerb

This ENUM lists possible HTTP Verbs. Note: 'Delete' is an Apex Keyword (DML) and as a result, the ENUM value 'DEL' is used for delete.

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