public dashboards: insert default public dashboard config into database on save (#49131)

This PR adds endpoints for saving and retrieving a public dashboard configuration and and api endpoint to retrieve the public dashboard.

All of this is highly experimental and APIs will change. Notably, we will be removing isPublic from the dashboard model and moving it over to the public dashboard table in the next release.

Further context can be found here: https://github.com/grafana/grafana/pull/49131#issuecomment-1145456952

pkg/models/dashboards.go

@@ -206,10 +206,6 @@ type Dashboard struct {
 	Data  *simplejson.Json
 }
 
-type PublicDashboardConfig struct {
-	IsPublic bool `json:"isPublic"`
-}
-
 func (d *Dashboard) SetId(id int64) {
 	d.Id = id
 	d.Data.Set("id", id)
@@ -417,12 +413,6 @@ type DeleteOrphanedProvisionedDashboardsCommand struct {
 	ReaderNames []string
 }
 
-type SavePublicDashboardConfigCommand struct {
-	Uid                   string
-	OrgId                 int64
-	PublicDashboardConfig PublicDashboardConfig
-}
-
 //
 // QUERIES
 //

pkg/models/dashboards_public.go

@@ -0,0 +1,43 @@
+package models
+
+var (
+	ErrPublicDashboardFailedGenerateUniqueUid = DashboardErr{
+		Reason:     "Failed to generate unique dashboard id",
+		StatusCode: 500,
+	}
+	ErrPublicDashboardNotFound = DashboardErr{
+		Reason:     "Public dashboard not found",
+		StatusCode: 404,
+		Status:     "not-found",
+	}
+	ErrPublicDashboardIdentifierNotSet = DashboardErr{
+		Reason:     "No Uid for public dashboard specified",
+		StatusCode: 400,
+	}
+)
+
+type PublicDashboardConfig struct {
+	IsPublic        bool            `json:"isPublic"`
+	PublicDashboard PublicDashboard `json:"publicDashboard"`
+}
+
+type PublicDashboard struct {
+	Uid          string `json:"uid" xorm:"uid"`
+	DashboardUid string `json:"dashboardUid" xorm:"dashboard_uid"`
+	OrgId        int64  `json:"orgId" xorm:"org_id"`
+	TimeSettings string `json:"timeSettings" xorm:"time_settings"`
+}
+
+func (pd PublicDashboard) TableName() string {
+	return "dashboard_public_config"
+}
+
+//
+// COMMANDS
+//
+
+type SavePublicDashboardConfigCommand struct {
+	DashboardUid          string
+	OrgId                 int64
+	PublicDashboardConfig PublicDashboardConfig
+}