mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-23 20:26:39 +00:00
120 lines
4 KiB
Go
120 lines
4 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package util
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import (
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"fmt"
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"net/url"
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apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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)
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// PageableResponseParams models the parameters to pass to PackagePageableResponse.
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//
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// The given items will be provided in the paged response.
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//
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// The other values are all used to create the Link header so that callers know
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// which endpoint to query next and previously in order to do paging.
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type PageableResponseParams struct {
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Items []interface{} // Sorted slice of items (statuses, notifications, etc)
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Path string // path to use for next/prev queries in the link header
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NextMaxIDKey string // key to use for the next max id query param in the link header, defaults to 'max_id'
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NextMaxIDValue string // value to use for next max id
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PrevMinIDKey string // key to use for the prev min id query param in the link header, defaults to 'min_id'
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PrevMinIDValue string // value to use for prev min id
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Limit int // limit number of entries to return
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ExtraQueryParams []string // any extra query parameters to provide in the link header, should be in the format 'example=value'
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}
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// PackagePageableResponse is a convenience function for returning
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// a bunch of pageable items (notifications, statuses, etc), as well
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// as a Link header to inform callers of where to find next/prev items.
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func PackagePageableResponse(params PageableResponseParams) (*apimodel.PageableResponse, gtserror.WithCode) {
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if params.NextMaxIDKey == "" {
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params.NextMaxIDKey = "max_id"
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}
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if params.PrevMinIDKey == "" {
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params.PrevMinIDKey = "min_id"
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}
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pageableResponse := EmptyPageableResponse()
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if len(params.Items) == 0 {
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return pageableResponse, nil
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}
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// items
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pageableResponse.Items = params.Items
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protocol := config.GetProtocol()
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host := config.GetHost()
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// next
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nextRaw := params.NextMaxIDKey + "=" + params.NextMaxIDValue
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if params.Limit != 0 {
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nextRaw = fmt.Sprintf("limit=%d&", params.Limit) + nextRaw
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}
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for _, p := range params.ExtraQueryParams {
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nextRaw = nextRaw + "&" + p
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}
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nextLink := &url.URL{
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Scheme: protocol,
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Host: host,
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Path: params.Path,
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RawQuery: nextRaw,
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}
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nextLinkString := nextLink.String()
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pageableResponse.NextLink = nextLinkString
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// prev
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prevRaw := params.PrevMinIDKey + "=" + params.PrevMinIDValue
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if params.Limit != 0 {
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prevRaw = fmt.Sprintf("limit=%d&", params.Limit) + prevRaw
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}
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for _, p := range params.ExtraQueryParams {
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prevRaw = prevRaw + "&" + p
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}
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prevLink := &url.URL{
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Scheme: protocol,
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Host: host,
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Path: params.Path,
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RawQuery: prevRaw,
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}
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prevLinkString := prevLink.String()
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pageableResponse.PrevLink = prevLinkString
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// link header
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next := fmt.Sprintf("<%s>; rel=\"next\"", nextLinkString)
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prev := fmt.Sprintf("<%s>; rel=\"prev\"", prevLinkString)
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pageableResponse.LinkHeader = next + ", " + prev
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return pageableResponse, nil
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}
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// EmptyPageableResponse just returns an empty
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// PageableResponse with no link header or items.
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func EmptyPageableResponse() *apimodel.PageableResponse {
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return &apimodel.PageableResponse{
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Items: []interface{}{},
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}
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}
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