Add "create a page" endpoint

README.md

@@ -16,7 +16,7 @@ Go client for the [Notion API](https://developers.notion.com/reference).
 ## Pages
 
 - [x] [Retrieve a page](client.go)
-- [ ] Create a page
+- [x] [Create a page](client.go)
 - [ ] Update page properties
 
 ### Blocks

block.go

@@ -0,0 +1,57 @@
+package notion
+
+import "time"
+
+// Block represents content on the Notion platform.
+// See: https://developers.notion.com/reference/block
+type Block struct {
+	Object         string     `json:"object"`
+	ID             string     `json:"id,omitempty"`
+	Type           BlockType  `json:"type"`
+	CreatedTime    *time.Time `json:"created_time,omitempty"`
+	LastEditedTime *time.Time `json:"last_edited_time,omitempty"`
+	HasChildren    bool       `json:"has_children"`
+
+	Paragraph        *RichTextBlock `json:"paragraph,omitempty"`
+	Heading1         *Heading       `json:"heading_1,omitempty"`
+	Heading2         *Heading       `json:"heading_2,omitempty"`
+	Heading3         *Heading       `json:"heading_3,omitempty"`
+	BulletedListItem *RichTextBlock `json:"bulleted_list_item,omitempty"`
+	NumberedListItem *RichText      `json:"numbered_list_item,omitempty"`
+	ToDo             *ToDo          `json:"to_do,omitempty"`
+	Toggle           *RichTextBlock `json:"toggle,omitempty"`
+	ChildPage        *ChildPage     `json:"rich_text,omitempty"`
+}
+
+type RichTextBlock struct {
+	Text     []RichText `json:"text"`
+	Children []Block    `json:"children,omitempty"`
+}
+
+type Heading struct {
+	Text []RichText `json:"text"`
+}
+
+type ToDo struct {
+	RichTextBlock
+	Checked *bool `json:"checked,omitempty"`
+}
+
+type ChildPage struct {
+	Title string `json:"title"`
+}
+
+type BlockType string
+
+const (
+	BlockTypeParagraph        BlockType = "paragraph"
+	BlockTypeHeading1         BlockType = "heading_1"
+	BlockTypeHeading2         BlockType = "heading_2"
+	BlockTypeHeading3         BlockType = "heading_3"
+	BlockTypeBulletedListItem BlockType = "bulleted_list_item"
+	BlockTypeNumberedListItem BlockType = "numbered_list_item"
+	BlockTypeToDo             BlockType = "to_do"
+	BlockTypeToggle           BlockType = "toggle"
+	BlockTypeChildPage        BlockType = "child_page"
+	BlockTypeUnsupported      BlockType = "unsupported"
+)

client.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"os"
 )
 
 const (
@@ -146,3 +147,42 @@ func (c *Client) FindPageByID(ctx context.Context, id string) (page Page, err er
 
 	return page, nil
 }
+
+// CreatePage creates a new page in the specified database or as a child of an existing page.
+// See: https://developers.notion.com/reference/post-page
+func (c *Client) CreatePage(ctx context.Context, params CreatePageParams) (page Page, err error) {
+	if err := params.Validate(); err != nil {
+		return Page{}, fmt.Errorf("notion: invalid page params: %w", err)
+	}
+
+	body := &bytes.Buffer{}
+
+	_ = json.NewEncoder(os.Stderr).Encode(params)
+
+	err = json.NewEncoder(body).Encode(params)
+	if err != nil {
+		return Page{}, fmt.Errorf("notion: failed to encode body params to JSON: %w", err)
+	}
+
+	req, err := c.newRequest(ctx, http.MethodPost, "/pages", body)
+	if err != nil {
+		return Page{}, fmt.Errorf("notion: invalid request: %w", err)
+	}
+
+	res, err := c.httpClient.Do(req)
+	if err != nil {
+		return Page{}, fmt.Errorf("notion: failed to make HTTP request: %w", err)
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode != http.StatusOK {
+		return Page{}, fmt.Errorf("notion: failed to create page: %w", parseErrorResponse(res))
+	}
+
+	err = json.NewDecoder(res.Body).Decode(&page)
+	if err != nil {
+		return Page{}, fmt.Errorf("notion: failed to parse HTTP response: %w", err)
+	}
+
+	return page, nil
+}

database.go

@@ -49,8 +49,8 @@ type SelectOptions struct {
 }
 
 type DatabaseProperty struct {
-	ID   string `json:"id"`
-	Type string `json:"type"`
+	ID   string               `json:"id"`
+	Type DatabasePropertyType `json:"type"`
 
 	Number      *NumberMetadata   `json:"number"`
 	Select      *SelectMetadata   `json:"select"`
@@ -136,19 +136,19 @@ type MultiSelectDatabaseQueryFilter struct {
 }
 
 type DateDatabaseQueryFilter struct {
-	Equals     time.Time `json:"equals,omitempty"`
-	Before     time.Time `json:"before,omitempty"`
-	After      time.Time `json:"after,omitempty"`
-	OnOrBefore time.Time `json:"on_or_before,omitempty"`
-	OnOrAfter  time.Time `json:"on_or_after,omitempty"`
-	IsEmpty    bool      `json:"is_empty,omitempty"`
-	IsNotEmpty bool      `json:"is_not_empty,omitempty"`
-	PastWeek   *struct{} `json:"past_week,omitempty"`
-	PastMonth  *struct{} `json:"past_month,omitempty"`
-	PastYear   *struct{} `json:"past_year,omitempty"`
-	NextWeek   *struct{} `json:"next_week,omitempty"`
-	NextMonth  *struct{} `json:"next_month,omitempty"`
-	NextYear   *struct{} `json:"next_year,omitempty"`
+	Equals     *time.Time `json:"equals,omitempty"`
+	Before     *time.Time `json:"before,omitempty"`
+	After      *time.Time `json:"after,omitempty"`
+	OnOrBefore *time.Time `json:"on_or_before,omitempty"`
+	OnOrAfter  *time.Time `json:"on_or_after,omitempty"`
+	IsEmpty    bool       `json:"is_empty,omitempty"`
+	IsNotEmpty bool       `json:"is_not_empty,omitempty"`
+	PastWeek   *struct{}  `json:"past_week,omitempty"`
+	PastMonth  *struct{}  `json:"past_month,omitempty"`
+	PastYear   *struct{}  `json:"past_year,omitempty"`
+	NextWeek   *struct{}  `json:"next_week,omitempty"`
+	NextMonth  *struct{}  `json:"next_month,omitempty"`
+	NextYear   *struct{}  `json:"next_year,omitempty"`
 }
 
 type PeopleDatabaseQueryFilter struct {
@@ -184,11 +184,33 @@ type DatabaseQuerySort struct {
 }
 
 type (
-	SortTimestamp string
-	SortDirection string
+	DatabasePropertyType string
+	SortTimestamp        string
+	SortDirection        string
 )
 
 const (
+	// Database property type enums.
+	DBPropTypeTitle          DatabasePropertyType = "title"
+	DBPropTypeRichText       DatabasePropertyType = "rich_text"
+	DBPropTypeNumber         DatabasePropertyType = "number"
+	DBPropTypeSelect         DatabasePropertyType = "select"
+	DBPropTypeMultiSelect    DatabasePropertyType = "multi_select"
+	DBPropTypeDate           DatabasePropertyType = "date"
+	DBPropTypePeople         DatabasePropertyType = "people"
+	DBPropTypeFile           DatabasePropertyType = "file"
+	DBPropTypeCheckbox       DatabasePropertyType = "checkbox"
+	DBPropTypeURL            DatabasePropertyType = "url"
+	DBPropTypeEmail          DatabasePropertyType = "email"
+	DBPropTypePhoneNumber    DatabasePropertyType = "phone_number"
+	DBPropTypeFormula        DatabasePropertyType = "formula"
+	DBPropTypeRelation       DatabasePropertyType = "relation"
+	DBPropTypeRollup         DatabasePropertyType = "rollup"
+	DBPropTypeCreatedTime    DatabasePropertyType = "created_time"
+	DBPropTypeCreatedBy      DatabasePropertyType = "created_by"
+	DBPropTypeLastEditedTime DatabasePropertyType = "last_edited_time"
+	DBPropTypeLastEditedBy   DatabasePropertyType = "last_edited_by"
+
 	// Sort timestamp enums.
 	SortTimeStampCreatedTime    SortTimestamp = "created_time"
 	SortTimeStampLastEditedTime SortTimestamp = "last_edited_time"

page.go

@@ -2,6 +2,7 @@ package notion
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"time"
 )
@@ -24,15 +25,17 @@ type Page struct {
 type PageParent struct {
 	Type string `json:"type"`
 
-	PageID     *string `json:"page_id"`
-	DatabaseID *string `json:"database_id"`
+	PageID     *string `json:"page_id,omitempty"`
+	DatabaseID *string `json:"database_id,omitempty"`
 }
 
 // PageProperties are properties of a page whose parent is a page or a workspace.
 type PageProperties struct {
-	Title struct {
-		Title []RichText `json:"title"`
-	} `json:"title"`
+	Title PageTitle `json:"title"`
+}
+
+type PageTitle struct {
+	Title []RichText `json:"title"`
 }
 
 // DatabasePageProperties are properties of a page whose parent is a database.
@@ -45,6 +48,76 @@ type DatabasePageProperty struct {
 	MultiSelect []SelectOptions `json:"multi_select"`
 }
 
+// CreatePageParams are the params used for creating a page.
+type CreatePageParams struct {
+	ParentType ParentType
+	ParentID   string
+
+	// Either DatabasePageProperties or Title must be not nil.
+	DatabasePageProperties *DatabasePageProperties
+	Title                  []RichText
+
+	// Optionally, children blocks are added to the page.
+	Children []Block
+}
+
+type ParentType string
+
+const (
+	ParentTypeDatabase ParentType = "database_id"
+	ParentTypePage     ParentType = "page_id"
+)
+
+func (p CreatePageParams) Validate() error {
+	if p.ParentType == "" {
+		return errors.New("parent type is required")
+	}
+	if p.ParentID == "" {
+		return errors.New("parent ID is required")
+	}
+	if p.ParentType == ParentTypeDatabase && p.DatabasePageProperties == nil {
+		return errors.New("database page properties is required when parent type is database")
+	}
+	if p.ParentType == ParentTypePage && p.Title == nil {
+		return errors.New("title is required when parent type is page")
+	}
+
+	return nil
+}
+
+func (p CreatePageParams) MarshalJSON() ([]byte, error) {
+	type CreatePageParamsDTO struct {
+		Parent     PageParent  `json:"parent"`
+		Properties interface{} `json:"properties"`
+		Children   []Block     `json:"children,omitempty"`
+	}
+
+	var parent PageParent
+
+	if p.DatabasePageProperties != nil {
+		parent.Type = "database_id"
+		parent.DatabaseID = StringPtr(p.ParentID)
+	} else if p.Title != nil {
+		parent.Type = "page_id"
+		parent.PageID = StringPtr(p.ParentID)
+	}
+
+	dto := CreatePageParamsDTO{
+		Parent:   parent,
+		Children: p.Children,
+	}
+
+	if p.DatabasePageProperties != nil {
+		dto.Properties = p.DatabasePageProperties
+	} else if p.Title != nil {
+		dto.Properties = PageTitle{
+			Title: p.Title,
+		}
+	}
+
+	return json.Marshal(dto)
+}
+
 // UnmarshalJSON implements json.Unmarshaler.
 //
 // Pages get a different Properties type based on the parent of the page.

rich_text.go

@@ -3,14 +3,14 @@ package notion
 import "time"
 
 type RichText struct {
-	PlainText   string      `json:"plain_text"`
-	HRef        *string     `json:"href"`
-	Annotations Annotations `json:"annotations"`
-	Type        string      `json:"type"`
+	Type        RichTextType `json:"type"`
+	Annotations *Annotations `json:"annotations,omitempty"`
 
-	Text     *Text     `json:"text"`
-	Mention  *Mention  `json:"mention"`
-	Equation *Equation `json:"equation"`
+	PlainText string    `json:"plain_text,omitempty"`
+	HRef      *string   `json:"href,omitempty"`
+	Text      *Text     `json:"text,omitempty"`
+	Mention   *Mention  `json:"mention,omitempty"`
+	Equation  *Equation `json:"equation,omitempty"`
 }
 
 type Equation struct {
@@ -18,41 +18,78 @@ type Equation struct {
 }
 
 type Annotations struct {
-	Bold          bool   `json:"bold"`
-	Italic        bool   `json:"italic"`
-	Strikethrough bool   `json:"strikethrough"`
-	Underline     bool   `json:"underline"`
-	Code          bool   `json:"code"`
-	Color         string `json:"color"`
+	Bold          bool  `json:"bold,omitempty"`
+	Italic        bool  `json:"italic,omitempty"`
+	Strikethrough bool  `json:"strikethrough,omitempty"`
+	Underline     bool  `json:"underline,omitempty"`
+	Code          bool  `json:"code,omitempty"`
+	Color         Color `json:"color,omitempty"`
 }
 
 type Mention struct {
-	Type string `json:"type"`
+	Type MentionType `json:"type"`
 
-	User     *User            `json:"user"`
-	Page     *PageMention     `json:"page"`
-	Database *DatabaseMention `json:"database"`
-	Date     *Date            `json:"date"`
+	User     *User `json:"user,omitempty"`
+	Page     *ID   `json:"page,omitempty"`
+	Database *ID   `json:"database,omitempty"`
+	Date     *Date `json:"date,omitempty"`
 }
 
 type Date struct {
 	Start time.Time  `json:"start"`
-	End   *time.Time `json:"end"`
+	End   *time.Time `json:"end,omitempty"`
 }
 
 type Text struct {
 	Content string `json:"content"`
-	Link    *Link  `json:"link"`
+	Link    *Link  `json:"link,omitempty"`
 }
 
 type Link struct {
 	URL string `json:"url"`
 }
 
-type PageMention struct {
+type ID struct {
 	ID string `json:"id"`
 }
 
-type DatabaseMention struct {
-	ID string `json:"id"`
-}
+type (
+	RichTextType string
+	MentionType  string
+	Color        string
+)
+
+const (
+	RichTextTypeText     RichTextType = "text"
+	RichTextTypeMention  RichTextType = "mention"
+	RichTextTypeEquation RichTextType = "equation"
+)
+
+const (
+	MentionTypeUser     MentionType = "user"
+	MentionTypePage     MentionType = "page"
+	MentionTypeDatabase MentionType = "database"
+	MentionTypeDate     MentionType = "date"
+)
+
+const (
+	ColorDefault  Color = "default"
+	ColorGray     Color = "gray"
+	ColorBrown    Color = "brown"
+	ColorOrange   Color = "orange"
+	ColorYellow   Color = "yellow"
+	ColorGreen    Color = "green"
+	ColorBlue     Color = "blue"
+	ColorPurple   Color = "purple"
+	ColorPink     Color = "pink"
+	ColorRed      Color = "red"
+	ColorGrayBg   Color = "gray_background"
+	ColorBrownBg  Color = "brown_background"
+	ColorOrangeBg Color = "orange_background"
+	ColorYellowBg Color = "yellow_background"
+	ColorGreenBg  Color = "green_background"
+	ColorBlueBg   Color = "blue_background"
+	ColorPurpleBg Color = "purple_background"
+	ColorPinkBg   Color = "pink_background"
+	ColorRedBg    Color = "red_background"
+)

util.go

@@ -0,0 +1,23 @@
+package notion
+
+import "time"
+
+// StringPtr returns the pointer of a string value.
+func StringPtr(s string) *string {
+	return &s
+}
+
+// IntPtr returns the pointer of an int value.
+func IntPtr(i int) *int {
+	return &i
+}
+
+// TimePtr returns the pointer of a time.Time value.
+func BoolPtr(b bool) *bool {
+	return &b
+}
+
+// TimePtr returns the pointer of a time.Time value.
+func TimePtr(t time.Time) *time.Time {
+	return &t
+}