gamebanana: add function for downloading mods

kinda janky with the implementation right now, later i would like to
improve the way files are copied and allow for mods with multiple
downloads attached to the mod. probably split off some of the
functionality later to add installing mods not on gamebanana easier.

gamebanana/download.go

@@ -0,0 +1,143 @@
+package gamebanana
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"github.com/charmbracelet/log"
+	"github.com/gen2brain/go-unarr"
+)
+
+var dlurl string
+
+func DownloadGameBananaMod(id, outdir string) (error) {
+	modData, err := GetGameBananaMod(id)
+	if err != nil {
+		return err
+	}
+
+	// create temporary file to download mod to
+	tmpFolderDownload, err := os.MkdirTemp("", "diva-mod-download-*")
+	log.Info("created temp folder for downloading", "name", tmpFolderDownload)
+	if err != nil {
+		return err
+	}
+
+	// really really jank, but api doesn't really have a better way of doing this
+	for _, x := range modData.FilesAFiles {
+		dlurl = x.SDownloadURL
+		break
+	}
+
+	fileDlPath := path.Join(tmpFolderDownload, "download")
+	fileDl, err := os.Create(fileDlPath)
+	if err != nil {
+		return err
+	}
+  defer fileDl.Close()
+
+	// download mod
+	resp, err := http.Get(dlurl)
+	log.Info("downloading mod", "url", dlurl, "modid", id, "path", fileDl)
+	// TODO: handle error code properly
+	if err != nil || resp.StatusCode != 200 {
+		return err
+	}
+  defer resp.Body.Close()
+
+	// save to temp file
+	_, err = io.Copy(fileDl, resp.Body)
+	if err != nil {
+		return err
+	}
+
+	// extract files to same directory
+	a, err := unarr.NewArchive(fileDlPath)
+	if err != nil {
+		return err
+	}
+
+	_, err = a.Extract(tmpFolderDownload)
+	if err != nil {
+		return err
+	}
+
+	// such jank but ive spent wayyy too long on this
+	var moddir string = ""
+	err = filepath.Walk(tmpFolderDownload, func(filePath string, _ fs.FileInfo, err error) error {
+		if path.Base(filePath) == "config.toml" {
+			moddir = path.Dir(filePath)
+			log.Info("found mod folder", "configloc", filePath)
+		}
+
+		return nil
+	})
+
+	if moddir == "" {
+		errors.New("config.toml not found in mod dir")
+	}
+
+	if err != nil {
+		return err
+	}
+
+	// create a folder put the mod in
+	outpath := path.Join(outdir, fmt.Sprintf("%s@%d", id, modData.Udate))
+	err = os.Mkdir(outpath, 0600)
+	if err != nil {
+		return err
+	}
+
+	err = filepath.Walk(moddir, func(filePath string, fileinfo fs.FileInfo, err error)  error {
+		relativepath := strings.Replace(filePath, moddir, "", 1)
+		newpath := path.Join(outdir, relativepath)
+
+		if relativepath == "" { return nil }
+
+		if fileinfo.IsDir() == true {
+			log.Warn("found directory, creating it!", "path", filePath, "relpath", relativepath, "newpath", newpath)
+			err = os.Mkdir(newpath, 0744)
+			if err != nil { return err }
+			return nil
+		}
+
+		var src *os.File
+		var dst *os.File
+
+		if src, err = os.Open(filePath); err != nil {
+			return err
+		}
+		defer src.Close()
+
+		if dst, err = os.Create(newpath); err != nil {
+			return err
+		}
+		defer dst.Close()
+
+		if _, err = io.Copy(dst, src); err != nil {
+			return err
+		}
+
+		log.Info("copied file!!!", "src", filePath, "dst", newpath, "relativepath", relativepath)
+		return os.Chmod(newpath, 0744)
+
+	})
+
+	if err != nil {
+		return err
+	}
+
+	// TODO: cleanup temp files
+	err = os.RemoveAll(fileDlPath)
+	if err != nil {
+		return err
+	}
+	return nil
+}

gamebanana/download_test.go

@@ -0,0 +1,24 @@
+package gamebanana
+
+import (
+	"os"
+	"path"
+	"testing"
+)
+
+func TestDownloadGameBananaMod(t *testing.T) {
+	tmpdir := t.TempDir()
+	err := DownloadGameBananaMod("602180", tmpdir)
+	if err != nil {
+		t.Error("failed to download game banana mod", err)
+	}
+
+	// udate is the time the mod was last updated
+	// in unix time, used here as a version number
+	// modID@udate
+	expectedPathToExist := path.Join(tmpdir, "602180@1750696716")
+
+	if _, err := os.Stat(expectedPathToExist); err != nil {
+		t.Error("mod doesn't have expected name or doesn't exist")
+	}
+}

gamebanana/mods.go

@@ -29,24 +29,7 @@ type GameBananaMod struct {
 	Description           string `json:"description"`
 	Downloads             int    `json:"downloads"`
 	FeedbackInstructions  string `json:"feedback_instructions"`
-	FilesAFiles           struct {
-		Num884808 struct {
-			IDRow                  string `json:"_idRow"`
-			SFile                  string `json:"_sFile"`
-			NFilesize              int    `json:"_nFilesize"`
-			TsDateAdded            int    `json:"_tsDateAdded"`
-			NDownloadCount         int    `json:"_nDownloadCount"`
-			SDownloadURL           string `json:"_sDownloadUrl"`
-			SMd5Checksum           string `json:"_sMd5Checksum"`
-			SAnalysisState         string `json:"_sAnalysisState"`
-			SAnalysisResult        string `json:"_sAnalysisResult"`
-			SAnalysisResultVerbose string `json:"_sAnalysisResultVerbose"`
-			SAvState               string `json:"_sAvState"`
-			SAvResult              string `json:"_sAvResult"`
-			BIsArchived            bool   `json:"_bIsArchived"`
-			BHasContents           bool   `json:"_bHasContents"`
-		} `json:"884808"`
-	} `json:"Files().aFiles()"`
+	FilesAFiles           map[string]gamebananaDownloadInformation `json:"Files().aFiles()"`
 	GameName                          string        `json:"Game().name"`
 	InstallInstructions               string        `json:"install_instructions"`
 	IsObsolete                        string        `json:"is_obsolete"`
@@ -91,6 +74,22 @@ type GameBananaMod struct {
 	WithholdBIsWithheld               bool          `json:"Withhold().bIsWithheld()"`
 }
 
+type gamebananaDownloadInformation struct {
+	IDRow                  string `json:"_idRow"`
+	SFile                  string `json:"_sFile"`
+	NFilesize              int    `json:"_nFilesize"`
+	TsDateAdded            int    `json:"_tsDateAdded"`
+	NDownloadCount         int    `json:"_nDownloadCount"`
+	SDownloadURL           string `json:"_sDownloadUrl"`
+	SMd5Checksum           string `json:"_sMd5Checksum"`
+	SAnalysisState         string `json:"_sAnalysisState"`
+	SAnalysisResult        string `json:"_sAnalysisResult"`
+	SAnalysisResultVerbose string `json:"_sAnalysisResultVerbose"`
+	SAvState               string `json:"_sAvState"`
+	SAvResult              string `json:"_sAvResult"`
+	BIsArchived            bool   `json:"_bIsArchived"`
+	BHasContents           bool   `json:"_bHasContents"`
+}
 
 func GetGameBananaMod(id string) (GameBananaMod, error) {
 	// build URL params
@@ -105,7 +104,7 @@ func GetGameBananaMod(id string) (GameBananaMod, error) {
   params.Add("itemid", id)
   params.Add("format", "json_min")
 	params.Add("return_keys", "1")
-  params.Add("fields", "apps_used,authors,Category().name,catid,contestid,creator,Credits().aAuthors(),Credits().aAuthorsAndGroups(),Credits().ssvAuthorNames(),date,description,downloads,feedback_instructions,Files().aFiles(),Game().name,install_instructions,is_obsolete,lastpost_date,lastpost_userid,likes,mdate,modnote,name,Nsfw().bIsNsfw(),obsol_notice,Owner().name,postcount,Posts().LastPost().idPosterRow(),Posts().LastPost().sText(),Posts().LastPost().tsDateAdded(),Posts().Postcount().nPostCount(),Preview().sStructuredDataFullsizeUrl(),Preview().sSubFeedImageUrl(),RootCategory().id,RootCategory().name,screenshots,studioid,text,Trash().bIsTrashed(),udate,Updates().aGetLatestUpdates(),Updates().aLatestUpdates(),Updates().bSubmissionHasUpdates(),Updates().nUpdatesCount(),Url().sDownloadUrl(),Url().sEditUrl(),Url().sEmbeddablesUrl(),Url().sHistoryUrl(),Url().sProfileUrl(),Url().sTrashUrl(),Url().sUntrashUrl(),Url().sUpdatesUrl(),Url().sWithholdUrl(),userid,views,Withhold().bIsWithheld()")
+  params.Add("fields", "apps_used,authors,Category().name,catid,contestid,creator,Credits().ssvAuthorNames(),date,description,downloads,feedback_instructions,Files().aFiles(),Game().name,install_instructions,is_obsolete,lastpost_date,lastpost_userid,likes,mdate,modnote,name,Nsfw().bIsNsfw(),obsol_notice,Owner().name,postcount,Posts().LastPost().idPosterRow(),Posts().LastPost().sText(),Posts().LastPost().tsDateAdded(),Posts().Postcount().nPostCount(),Preview().sStructuredDataFullsizeUrl(),Preview().sSubFeedImageUrl(),RootCategory().id,RootCategory().name,screenshots,studioid,text,Trash().bIsTrashed(),udate,Updates().aGetLatestUpdates(),Updates().aLatestUpdates(),Updates().bSubmissionHasUpdates(),Updates().nUpdatesCount(),Url().sDownloadUrl(),Url().sEditUrl(),Url().sEmbeddablesUrl(),Url().sHistoryUrl(),Url().sProfileUrl(),Url().sTrashUrl(),Url().sUntrashUrl(),Url().sUpdatesUrl(),Url().sWithholdUrl(),userid,views,Withhold().bIsWithheld()")
   base.RawQuery = params.Encode()
 
 	// send request

go.mod

@@ -4,6 +4,7 @@ go 1.24.5
 
 require (
 	github.com/charmbracelet/log v0.4.2
+	github.com/gen2brain/go-unarr v0.2.4
 	github.com/google/go-cmp v0.5.8
 )
 

go.sum

@@ -14,6 +14,8 @@ github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQ
 github.com/charmbracelet/x/term v0.2.1/go.mod h1:oQ4enTYFV7QN4m0i9mzHrViD7TQKvNEEkHUMCmsxdUg=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gen2brain/go-unarr v0.2.4 h1:Iu2kqtGfkLBSQoTFwMkSCmp0g3GrEM/XMVWzo9TQr/Y=
+github.com/gen2brain/go-unarr v0.2.4/go.mod h1:0kdy3HtjKBcEaewifXZguHCvt4qD9V8iJCx4FPEOWT8=
 github.com/go-logfmt/logfmt v0.6.0 h1:wGYYu3uicYdqXVgoYbvnkrPVXkuLM1p1ifugDMEdRi4=
 github.com/go-logfmt/logfmt v0.6.0/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
 github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=