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diff --git a/mod/mod-ci-github-gh.hxx b/mod/mod-ci-github-gh.hxx
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+// file      : mod/mod-ci-github-gh.hxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef MOD_MOD_CI_GITHUB_GH_HXX
+#define MOD_MOD_CI_GITHUB_GH_HXX
+
+#include <libbrep/types.hxx>
+#include <libbrep/utility.hxx>
+
+#include <libbrep/build.hxx>
+
+#include <mod/tenant-service.hxx> // build_hints
+
+namespace butl
+{
+  namespace json
+  {
+    class parser;
+  }
+}
+
+namespace brep
+{
+  using build_queued_hints = tenant_service_build_queued::build_queued_hints;
+
+  // GitHub request/response types (all start with gh_).
+  //
+  // Note that the GitHub REST and GraphQL APIs use different ID types and
+  // values. In the REST API they are usually integers (but sometimes
+  // strings!) whereas in GraphQL they are always strings (note:
+  // base64-encoded and opaque, not just the REST ID value as a string).
+  //
+  // In both APIs the ID field is called `id`, but REST responses and webhook
+  // events also contain the corresponding GraphQL object's ID in the
+  // `node_id` field.
+  //
+  // In the structures below we always use the RESP API/webhook names for ID
+  // fields. I.e., `id` always refers to the REST/webhook ID, and `node_id`
+  // always refers to the GraphQL ID.
+  //
+  namespace json = butl::json;
+
+  // The "check_suite" object within a check_suite webhook event request.
+  //
+  struct gh_check_suite
+  {
+    string node_id;
+    string head_branch;
+    string head_sha;
+
+    explicit
+    gh_check_suite (json::parser&);
+
+    gh_check_suite () = default;
+  };
+
+  struct gh_check_run
+  {
+    string node_id;
+    string name;
+    string status;
+
+    explicit
+    gh_check_run (json::parser&);
+
+    gh_check_run () = default;
+  };
+
+  // Return the GitHub check run status corresponding to a build_state.
+  //
+  string
+  gh_to_status (build_state st);
+
+  // Return the build_state corresponding to a GitHub check run status
+  // string. Throw invalid_argument if the passed status was invalid.
+  //
+  build_state
+  gh_from_status (const string&);
+
+  // Create a check_run name from a build. If the second argument is not
+  // NULL, return an abbreviated id if possible.
+  //
+  string
+  gh_check_run_name (const build&, const build_queued_hints* = nullptr);
+
+  struct gh_repository
+  {
+    string node_id;
+    string name;
+    string full_name;
+    string default_branch;
+    string clone_url;
+
+    explicit
+    gh_repository (json::parser&);
+
+    gh_repository () = default;
+  };
+
+  struct gh_installation
+  {
+    uint64_t id; // Note: used for installation access token (REST API).
+
+    explicit
+    gh_installation (json::parser&);
+
+    gh_installation () = default;
+  };
+
+  // The check_suite webhook event request.
+  //
+  struct gh_check_suite_event
+  {
+    string action;
+    gh_check_suite check_suite;
+    gh_repository repository;
+    gh_installation installation;
+
+    explicit
+    gh_check_suite_event (json::parser&);
+
+    gh_check_suite_event () = default;
+  };
+
+  struct gh_installation_access_token
+  {
+    string token;
+    timestamp expires_at;
+
+    explicit
+    gh_installation_access_token (json::parser&);
+
+    gh_installation_access_token (string token, timestamp expires_at);
+
+    gh_installation_access_token () = default;
+  };
+
+  string
+  gh_to_iso8601 (timestamp);
+
+  timestamp
+  gh_from_iso8601 (const string&);
+
+  ostream&
+  operator<< (ostream&, const gh_check_suite&);
+
+  ostream&
+  operator<< (ostream&, const gh_check_run&);
+
+  ostream&
+  operator<< (ostream&, const gh_repository&);
+
+  ostream&
+  operator<< (ostream&, const gh_installation&);
+
+  ostream&
+  operator<< (ostream&, const gh_check_suite_event&);
+
+  ostream&
+  operator<< (ostream&, const gh_installation_access_token&);
+}
+
+#endif // MOD_MOD_CI_GITHUB_GH_HXX