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description=Client libraries that let you get started programmatically with IAM in C#, Go, Java, and Python.;

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ser account for example user my user example com note the following snippet modifies access by getting modifying and setting the allow policy for the project for more information on allow policies see the iam overview c to learn how to install and use the client library for resource manager see resource manager client libraries for more information see the resource manager c api reference documentation to authenticate to resource manager set up application default credentials for more information see set up authentication for a local development environment using google apis auth oauth2 using google apis cloudresourcemanager v1 using google apis cloudresourcemanager v1 data using google apis iam v1 using system using system collections generic using system linq public class quickstart public static void main string args todo replace with your project id var projectid your project todo replace with the id of your principal for examples see https cloud google com iam docs principal identifiers var member your principal role to be granted var role roles logging logwriter initialize service cloudresourcemanagerservice crmservice initializeservice grant your principal the log writer role for your project addbinding crmservice projectid member role get the project s policy and print all principals with the the log writer role var policy getpolicy crmservice projectid var binding policy bindings firstordefault x x role role console writeline role binding role console write members foreach var m in binding members console write m console writeline remove principal from the log writer role removemember crmservice projectid member role public static cloudresourcemanagerservice initializeservice get credentials var credential googlecredential getapplicationdefault createscoped iamservice scope cloudplatform create the cloud resource manager service object cloudresourcemanagerservice crmservice new cloudresourcemanagerservice new cloudresourcemanagerservice initializer httpclientinitializer credential return crmservice public static policy getpolicy cloudresourcemanagerservice crmservice string projectid get the project s policy by calling the cloud resource manager projects api var policy crmservice projects getiampolicy new getiampolicyrequest projectid execute return policy public static void setpolicy cloudresourcemanagerservice crmservice string projectid policy policy set the project s policy by calling the cloud resource manager projects api crmservice projects setiampolicy new setiampolicyrequest policy policy projectid execute public static void addbinding cloudresourcemanagerservice crmservice string projectid string member string role get the project s policy var policy getpolicy crmservice projectid find binding in policy var binding policy bindings firstordefault x x role role if binding already exists add principal to binding if binding null binding members add member if binding does not exist add binding to policy else binding new binding role role members new list string member policy bindings add binding set the updated policy setpolicy crmservice projectid policy public static void removemember cloudresourcemanagerservice crmservice string projectid string member string role get the project s policy var policy getpolicy crmservice projectid remove the principal from the role var binding policy bindings firstordefault x x role role if binding null console writeline role does not exist in policy else if binding members contains member binding members remove member else console writeline the member has not been granted this role if binding members count 0 policy bindings remove binding set the updated policy setpolicy crmservice projectid policy go to learn how to install and use the client library for resource manager see resource manager client libraries for more information see the resource manager go api reference documentation to authenticate to resource manager set up application default credentials for more information see set up authentication for a local development environment package main import context flag fmt log strings time google golang org api cloudresourcemanager v1 func main todo add your project id projectid flag string project_id cloud project id todo add the id of your principal for examples see https cloud google com iam docs principal identifiers member flag string member_id your principal id flag parse the role to be granted var role string roles logging logwriter initializes the cloud resource manager service ctx context background crmservice err cloudresourcemanager newservice ctx if err nil log fatalf cloudresourcemanager newservice v err grants your principal the log writer role for your project addbinding crmservice projectid member role gets the project s policy and prints all principals with the log writer role policy getpolicy crmservice projectid find the policy binding for role only one binding can have the role var binding cloudresourcemanager binding for _ b range policy bindings if b role role binding b break fmt println role binding role fmt print members strings join binding members removes member from the log writer role removemember crmservice projectid member role addbinding adds the principal to the project s iam policy func addbinding crmservice cloudresourcemanager service projectid member role string policy getpolicy crmservice projectid find the policy binding for role only one binding can have the role var binding cloudresourcemanager binding for _ b range policy bindings if b role role binding b break if binding nil if the binding exists adds the principal to the binding binding members append binding members member else if the binding does not exist adds a new binding to the policy binding cloudresourcemanager binding role role members string member policy bindings append policy bindings binding setpolicy crmservice projectid policy removemember removes the principal from the project s iam policy func removemember crmservice cloudresourcemanager service projectid member role string policy getpolicy crmservice projectid find the policy binding for role only one binding can have the role var binding cloudresourcemanager binding var bindingindex int for i b range policy bindings if b role role binding b bindingindex i break order doesn t matter for bindings or members so to remove move the last item into the removed spot and shrink the slice if len binding members 1 if the principal is the only member in the binding removes the binding last len policy bindings 1 policy bindings bindingindex policy bindings last policy bindings policy bindings last else if there is more than one member in the binding removes the principal var memberindex int for i mm range binding members if mm member memberindex i last len policy bindings bindingindex members 1 binding members memberindex binding members last binding members binding members last setpolicy crmservice projectid policy getpolicy gets the project s iam policy func getpolicy crmservice cloudresourcemanager service projectid string cloudresourcemanager policy ctx context background ctx cancel context withtimeout ctx time second 10 defer cancel request new cloudresourcemanager getiampolicyrequest policy err crmservice projects getiampolicy projectid request do if err nil log fatalf projects getiampolicy v err return policy setpolicy sets the project s iam policy func setpolicy crmservice cloudresourcemanager service projectid string policy cloudresourcemanager policy ctx context background ctx cancel context withtimeout ctx time second 10 defer cancel request new cloudresourcemanager setiampolicyrequest request policy policy policy err crmservice projects setiampolicy projectid request do if err nil log fatalf projects setiampolicy v err java to learn how to install and use the client library for resource manager see resource manager client libraries for more information see the resource manager java api reference documentation to authenticate to resource manager set up application default credentials for more information see set up authentication for a local development environment import com google cloud iam admin v1 iamclient import com google iam admin v1 serviceaccountname import com google iam v1 binding import com google iam v1 getiampolicyrequest import com google iam v1 policy import com google iam v1 setiampolicyrequest import com google protobuf fieldmask import java io ioexception import java util arraylist import java util arrays import java util list public class quickstart public static void main string args throws ioexception todo replace with your project id string projectid your project todo replace with your service account name string serviceaccount your service account todo replace with the id of your principal for examples see https cloud google com iam docs principal identifiers string member your principal the role to be granted string role roles logging logwriter quickstart projectid serviceaccount member role creates new policy and adds binding checks if changes are present and removes policy public static void quickstart string projectid string serviceaccount string member string role throws ioexception construct the service account email you can modify the iam gserviceaccount com to match the name of the service account to use for authentication serviceaccount serviceaccount projectid iam gserviceaccount com initialize client that will be used to send requests this client only needs to be created once and can be reused for multiple requests try iamclient iamclient iamclient create grants your principal the log writer role for your project addbinding iamclient projectid serviceaccount member role get the project s policy and print all principals with the log writer role policy policy getpolicy iamclient projectid serviceaccount binding binding null list binding bindings policy getbindingslist for binding b bindings if b getrole equals role binding b break system out println role binding getrole system out print principals for string m binding getmemberslist system out print m system out println removes principal from the log writer role removemember iamclient projectid serviceaccount member role public static void addbinding iamclient iamclient string projectid string serviceaccount string member string role gets the project s policy policy policy getpolicy iamclient projectid serviceaccount if policy is not retrieved return early if policy null return policy builder updatedpolicy policy tobuilder get the binding if present in the policy binding binding null for binding b updatedpolicy getbindingslist if b getrole equals role binding b break if binding null if binding already exists adds principal to binding binding getmemberslist add member else if binding does not exist adds binding to policy binding binding newbuilder setrole role addmembers member build updatedpolicy addbindings binding sets the updated policy setpolicy iamclient projectid serviceaccount updatedpolicy build public static void removemember iamclient iamclient string projectid string serviceaccount string member string role gets the project s policy policy builder policy getpolicy iamclient projectid serviceaccount tobuilder removes the principal from the role binding binding null for binding b policy getbindingslist if b getrole equals role binding b break if binding null binding getmemberslist contains member list string newmemberlist new arraylist binding getmemberslist newmemberlist remove member binding newbinding binding tobuilder clearmembers addallmembers newmemberlist build list binding newbindinglist new arraylist policy getbindingslist newbindinglist remove binding if newbinding getmemberslist isempty newbindinglist add newbinding policy clearbindings addallbindings newbindinglist sets the updated policy setpolicy iamclient projectid serviceaccount policy build public static policy getpolicy iamclient iamclient string projectid string serviceaccount gets the project s policy by calling the iamclient api getiampolicyrequest request getiampolicyrequest newbuilder setresource serviceaccountname of projectid serviceaccount tostring build return iamclient getiampolicy request private static void setpolicy iamclient iamclient string projectid string serviceaccount policy policy list string paths arrays aslist bindings etag sets a project s policy setiampolicyrequest request setiampolicyrequest newbuilder setresource serviceaccountname of projectid serviceaccount tostring setpolicy policy a fieldmask specifying which fields of the policy to modify only the fields in the mask will be modified if no mask is provided the following default mask is used paths bindings etag setupdatemask fieldmask newbuilder addallpaths paths build build iamclient setiampolicy request python to learn how to install and use the client library for resource manager see resource manager client libraries for more information see the resource manager python api reference documentation to authenticate to resource manager set up application default credentials for more information see set up authentication for a local development environment from google cloud import resourcemanager_v3 from google iam v1 import iam_policy_pb2 policy_pb2 def quickstart project_id str principal str none demonstrates basic iam operations this quickstart shows how to get a project s iam policy add a principal to a role list members of a role and remove a principal from a role args project_id id or number of the google cloud project you want to use principal the principal id requesting the access role to be granted role roles logging logwriter crm_service resourcemanager_v3 projectsclient grants your principal the log writer role for the project modify_policy_add_role crm_service project_id role principal gets the project s policy and prints all principals with the log writer role policy get_policy crm_service project_id binding next b for b in policy bindings if b role role print f role binding role print members for m in binding members print f m removes the principal from the log writer role modify_policy_remove_principal crm_service project_id role principal def get_policy crm_service resourcemanager_v3 projectsclient project_id str policy_pb2 policy gets iam policy for a project request iam_policy_pb2 getiampolicyrequest request resource f projects project_id policy crm_service get_iam_policy request return policy def set_policy crm_service resourcemanager_v3 projectsclient project_id str policy policy_pb2 policy none adds a new role binding to a policy request iam_policy_pb2 setiampolicyrequest request resource f projects project_id request policy copyfrom policy crm_service set_iam_policy request def modify_policy_add_role crm_service resourcemanager_v3 projectsclient project_id str role str principal str none adds a new role binding to a policy policy get_policy crm_service project_id for bind in policy bindings if bind role role bind members append principal bre...